He is a beautiful ginger boy. Had him since he was a kitten. The most loving cat we have ever had. To look at him he seems big and chunky but if you pick him up he is quite frail. The vet has given him the all clear but I did think a thyroid problem when the endless crying for food started. Never experienced anything like it. He was becoming a danger in the kitchen as always round our feet when trying to cook. The noise was like a crying baby, not even a normal sound.
All seems calm if we get him fed, give a little cream and then pop him into the spare room and he goes to sleep. Otherwise he just gets worse and worse crying for the food.
my old cat  did that when she went dotty, she stopped if i called her, regardless of whether she came, i read that they just need to know that you`re there. it`s a horribly distressing sound isn`t it.