Hi SK.,
(I hope that you are feeling better, and getting over your illness.)
Maybe asking yourself this might help...
What was my fear level about
cardio issues before I started to visit my uncle in the hospital?
What is it now?
If the answer is that you have a markedly increased level, then perhaps limiting your time spent visiting the hospital is a prudent move, for your current state of mind.
Only you can decide what the trade off as far as the pros and cons of pushing yourself out of your comfort zone is...yes, watching our triggers is important, but so is supporting family.
I hope that you can come to a point of deciding to read some of the recommended books that we have here on CBT/health anxiety
(in our Resources). I really believe that they could help.
Wishing you and your family the best!
S.C.