OP… are you me???
Seriously, down to the Crohn’s disease, I related to so much of your post.
I am working through a lot of the same issues as you. All I can offer as advice is - don’t continue to push yourself until you are burned out from riding completely. That is the point that I am at. My young green horse that I took a fall from (one of many, unfortunately) is for sale. Once he sells I am taking a major step back. I will be looking into a half lease at a barn that is more laid back and fun. Trail rides, cow sorting, etc. I am burned by and burnt out from the hunter/jumper world and the model it is moving towards.
Also, I think from what you shared, your trainer’s responses have been very much lacking. The fact that she didn’t once check in on you is unacceptable to me, and speaks volumes.
Here is my thread if you want to read it. Some similar challenges, some different. Just know you are not alone!