Originally Posted by postit:
“If my hospital appointment today gives good results maybe I won't need a sharpener at all”
Probably too late now, but if you're in such a situation for long, perhaps one option would be to buy a cheap knife from a supermarket (£2-3) and a crude sharpener from wherever you can find one (Poundland, Poundstretcher, etc) and use those. You can wear down the knife all you like and not worry about stripping metal from good knives meant to last decades.
In the kitchen, I probably use just one sharp knife 99% of the time. Occasionally using a second, smaller one, and that's often out of laziness.