I just found and joined this site today, but wanted to encourage you because I was not firmly diagnosed either for several months. Read Stellatum's note again. She/he is on the mark and parellel's my experience. You can be nerve fiber negative and single fiber negative and still have MG. If both of these are negative make sure they test you for the MuSK anti-body. They will not routinely order this test even if they suspect MG. Also, please please please, you must have a neurologist who has expertise in neuro-muscular diseases. Godspeed.