I am no expert (far, far from it) but I think that you are reacting to the fear of something happening again to both you and your pouch.
It could be a form of PTSD coming to haunt you now that the worst is over.
You have healed physically and now your brain is trying to play catch-up. Every illness, cold or pain is waking up the fear of backsliding into being sick again.
I could be wrong (and often am).
I went through a period of severe claustrophobia...sudden onset and paralyzing. I couldn't fly, get into a crowded subway car or an elevator. I had never been claustrophobic before but basically understood what was happening. This was very problematic because I had to use public transportation daily to get to work...I walked hours and took a lot of stairs (not practical when you work in towers).
When it started affecting my life negatively I asked my neurologist to give me a few therapy sessions...it took about 5 in all to get to the crux of the problem and face the fear...I still have residual fear of tiny spaces (getting stuck in elevators...but I survived a very unromantic Valentine's evening stuck in a tiny elevator with another couple...for 4hrs...and did not wig out!).
I hope that whatever it is turns out to be an easy fix...or just situational.
Sharon