I'm confused. You have a positive blood test and he still doesn't think you have MG? that doesn't sound right. Unless I am reading this incorrectly, I would like for you to know that I was diagnosed with MG and the single fiber EMG was tried on my hand and on my forehead and it didn't come back positive. They said it was normal. I mainly have/had bulbar symptoms. I have confirmed mild eye lid weakness now and I do get fatigued easily that tends to get better with rest. I have the positive ACHR test and had it reran at multiple/different labs and it has been confirmed each time. I'm really sorry you're going through this . Please hang in there and keep your chin up.