Hi everyone. Im looking for as much advice as possible if anyone has any 
I have a 2 and a half yr old Border terrier (female)
(Her name is Peppa by the way)
She has been a very healthy dog up untill New years day this year. She was chilled out on the sofa with us, half asleep, when someone banged quite loudly on our door. She immediately jumped up and started barking as she normally would...jumped onto the floor and by the time i had bought the person in, she staggered backwards and just fell to the floor. It looked like she had keeled over on the spot. She sempt to be unconcious for only about 15 seconds...i picked her up and lay with her on the sofa to keep her calm. After this she sempt very tired for the rest of the evening. I phoned the emergency vets and they told me to keep an eye on her as she is otherwise healthy.
All was well after that untill a week after.
It was sunday the 9th january, again peppa was chilling out on the sofa, asleep. when someone knocked rather loudly on my door again. The exact same thing happened, but this time she lost controll of her bladder. She was out for about 20/25 seconds this time. So i called the emergency vets again and this time they said they wanted to see her.
They did a full blood count (all came back normal)
took her temperature (normal)
heart sounded good
but when she listened to her lungs, she was concerned that she could slightly heard peppa taking in a sharp intake of breath. She asked if we had heard any wheezing, which we hadnt, but she gave her antibiotics to clear any chest infection up just in case.
A week on her antibiotics, and plenty of people knocking and no more "episodes" We all assumed she must have had an infection, which was now gone...How wrong were we?
This morning it happened again, this time though, it happened differently...
Myself, partner kids and peppa were lazing on my bed (always seems to happen when we're chilling out lol...i assure you we're not a lazy family lol) And my boyfriend held peppa above him so she could see out the window. Peppa then started barking at something outside, so my bf put her back on the bed to stop her barking. As soon as he did, we noticed her staggering again, she looks like shes got up too fast or something, you can see the dizziness in her. then she fell to one side again, more relaxed muscles this time though, and she didnt seem to be unconcious. Previously at the vets we were told to check her gum colour if it happened again, so we did. They were pure white.
I took her to the vets immediately and she said that her heart, pulse and lungs all sounded fine. Her gum colour was starting to return to her natural salmon pink colour. So she suggested that before she book her in for a chest xray, We research something, talk again in a week and discuss what we will do from there. She thinks she has heard of something that only border terriers suffer from, and if its that then there is no cure. She couldnt remember the name of it though. After researching, all i can come up with is something called CECS. But she doesnt spasm when she has these episodes. So now i'm really confused.
Does anyone have any suggestions?
Thank you and i do apologise for the very long post. I just wanted to mention anything i could think of.

I have a 2 and a half yr old Border terrier (female)
(Her name is Peppa by the way)
She has been a very healthy dog up untill New years day this year. She was chilled out on the sofa with us, half asleep, when someone banged quite loudly on our door. She immediately jumped up and started barking as she normally would...jumped onto the floor and by the time i had bought the person in, she staggered backwards and just fell to the floor. It looked like she had keeled over on the spot. She sempt to be unconcious for only about 15 seconds...i picked her up and lay with her on the sofa to keep her calm. After this she sempt very tired for the rest of the evening. I phoned the emergency vets and they told me to keep an eye on her as she is otherwise healthy.
All was well after that untill a week after.
It was sunday the 9th january, again peppa was chilling out on the sofa, asleep. when someone knocked rather loudly on my door again. The exact same thing happened, but this time she lost controll of her bladder. She was out for about 20/25 seconds this time. So i called the emergency vets again and this time they said they wanted to see her.
They did a full blood count (all came back normal)
took her temperature (normal)
heart sounded good
but when she listened to her lungs, she was concerned that she could slightly heard peppa taking in a sharp intake of breath. She asked if we had heard any wheezing, which we hadnt, but she gave her antibiotics to clear any chest infection up just in case.
A week on her antibiotics, and plenty of people knocking and no more "episodes" We all assumed she must have had an infection, which was now gone...How wrong were we?
This morning it happened again, this time though, it happened differently...
Myself, partner kids and peppa were lazing on my bed (always seems to happen when we're chilling out lol...i assure you we're not a lazy family lol) And my boyfriend held peppa above him so she could see out the window. Peppa then started barking at something outside, so my bf put her back on the bed to stop her barking. As soon as he did, we noticed her staggering again, she looks like shes got up too fast or something, you can see the dizziness in her. then she fell to one side again, more relaxed muscles this time though, and she didnt seem to be unconcious. Previously at the vets we were told to check her gum colour if it happened again, so we did. They were pure white.
I took her to the vets immediately and she said that her heart, pulse and lungs all sounded fine. Her gum colour was starting to return to her natural salmon pink colour. So she suggested that before she book her in for a chest xray, We research something, talk again in a week and discuss what we will do from there. She thinks she has heard of something that only border terriers suffer from, and if its that then there is no cure. She couldnt remember the name of it though. After researching, all i can come up with is something called CECS. But she doesnt spasm when she has these episodes. So now i'm really confused.
Does anyone have any suggestions?

Thank you and i do apologise for the very long post. I just wanted to mention anything i could think of.
Yes...yes you are.