I believe I know what you’re saying about having symptoms but nothing definitely showing on blood or other tests. I have been there so many times and it can be crushing. I remember crying after an appointment like that but can’t even remember what was wrong Most of those kind of appointments were related to muscle symptoms and doctors wanted to label me with fibromyalgia even though it was only my upper trunk. Like you I had to wait for the diagnosis to be made on nerve stimulation tests and cervical MRI. I very much appreciate your nice post