I have some weird neuromuscular disorder that is improved by IVG (not seropositive MG).. and it is also dramatically affected by hormones- premenstrual all my muscles get weak, esp swallowing and my droopy eyelids!!! Thats when I landed in the hospital a year ago, my symptoms got so bad at that time of the month I couldn't move or breathe!! I'll be curious to hear others responses!