So sorry to hear that Cristina

I haven't been around too much lately so I'm not familiar with your MG information. I take it that you are seronegative? I'm saying that because that's a typical response from a doctor for a seronegative MG'er. I'm seronegative but was fortunate enough to have a neurologist diagnose my MG due to my symptoms, EMG and Tensilon Test 18 years ago.
This disease is not in your head. You're not crazy although going through doctor appointments such as yours is enough to drive you crazy. Have you had an EMG, SFMG or any other tests? How many Neuro's have you seen?
All I can say is hang in there. Find another Neuro if you have to and keep plugging at it until you find someone who will give you the help you need and give you an accurate diagnosis.
I'll keep you in my prayers