Tammy, I have known a few people who use the excuse that they felt better before going on meds or starting treatment. Form of denial? Being overwhelmed about having to do treatments and taking medications.
I had a similar feeling when DS was a baby with one of his medications -- I HATED giving it to him as he'd spit it out right back in my face. Was soooo stressful that I began looking for excuses as to why I shouldn't give it to him -- maybe it was causing a rash, maybe it caused stomach upset and he wouldn't eat. I pushed through, he got used to it and things were fine, but it was just one more thing that almost pushed me over the edge. It wasn't fair that other people got to bring home normal healthy babies and didn't have spend 3-4 times a day doing treatments, medications and feeds every 3 hours.
Could be something similar your son is going through, too. Having to adjust to everything. As for the community waiting room -- we had a similar issue when DS was a baby. Kept our distance, tried not to touch any surfaces -- chairs, used hand sanitizer after touching pens, surfaces. We once walked out of a clinic appointment when we arrived at our designated time and they made us wait for half an hour. After that they made sure to put us in a room immediately or they knew we'd walk.