I feel for you. It's a tough situation compounded by your health issues and medication.
Bottom line for me though (having been there) is: once the trust is gone it's almost impossible to get it back. And trust is the foundation of any relationship. Without it there is no way forward.
I look forward to hearing how things go for you. Those of us who have been in your shoes know the emotional trauma that goes with it. It is never an easy decision. I wish you all the best in resolving this!