first, I hope your health gets better and you are under proper treatment.
Second and more:
1. Do not sign up for any more cards unless you are able to keep things organized, etc. Spread sheets are an easy way to do this. If you are not doing manufactured spending, a spread sheet that is basic is all you need. You can refer to it when you think about signing up for a nother card etc.
2. It is always worth asking the CC company if they can waive the fee or give you an incentive to keep the card. If not, ask if they can downgrade to a no fee card.
3. you may want to consider a chase freedom card to keep one chase ultimate rewards card open to keep all your points as you close the other cards, if you do close them
Anyway, hope things get better.