To the OP... I saw your post in the Folding Bike forum, and came here given that you said you cross posted. After reading your posts, I really think you need to re-consider: 1) bike fit; 2) your physical condition; 3) how you ride. There are literally tons of posts in the Folding Bike forum, and very few are about health related problems. The problem could be your bike, but I doubt it. I and many others have ridden hundreds to thousands of kilometres on folding bikes with few, if any, ill effects. You seem to be very much into consulting all sorts of medical specialists: before you start looking at all sorts of complicated scenarios and solutions, look at the simpler ones. If many others have ridden folding bikes without significant problems, and if you are generally healthy, then it is probably neither the bike nor a serious medical complication but rather if you have been fitted to the bike or how you ride the bike.

And I noticed you don't seem too keen on the Canadian health system: it's not perfect, but I wouldn't want to live anywhere else.

Good luck.