Welcome. It is so frustrating when the Docs can't figure out what is wrong and keep making guesses. Don't give up though. Keep pestering them until someone takes the time to do all the tests and come up with an answer.

I had a Doc that I really trusted and thought of as a friend. He and his wife used to socialize with us and everything. Finally, after many years of treatment he told me he thought I was "hypervigilent" and there was nothing wrong with me. I felt so betrayed. I went to a new Doc who did the right tests and gave me a true diagnosis. It gets tiring but it is worth it.