No, I had it too. It started with the MG 2 years ago and never went away, even for a second. It got worse as the day progressed and on days when my MG was bad. I also was hypersensitive to loud noises and would jump or be startled at noises that did not bother anybody else. I tried doing a lot of research on line about it. the best I could find where the following 2 scenarios and I do not know if either are correct:

1. there are small muscles in the inner ear affected by MG causing the tinnitis
2. There are ganglionic (not muscle) ACHR that affect the Autonomic nervous system including hearing, tinitus, balance and vertigo as well abdominal function, heart etc

thanks
kathie