dysautonomia
"I've been on 30mg of Mestinon two times a day for about three months, I had diarrhea the first few days, more shortness of breath, and some drowsiness, after that I started noticing improvement in my cognition (the worst part of my dysautonomia & Fibromyalgia, to me), and I am able to keep 'doing' things longer than I could before.  I do notice when it begins to wear off and I may go up to three times a day on it.  I'm very pleased.  The only negative I have is big increase in eyelid twitching, and awful muscle spasms in my feet.  My neurologist has had me start B-6 for this and it helps a lot."