That is just one of the side effects I would get when I had to take it all the time. I understand completly what you mean about being afraid to go anywhere. For me, it was on the third day of taking it that I would get it that bad. Fortunatly, I can go days without having to take any, so it dosen't get to that point anymore. My neuro prescribed a med to help with that side effect, and I'm sorry, but I forget what it was called. I'm sure many here would know. If you call your Dr. he/she may prescribe something for you. Also, as your body adjusts to the mestinon, you may find it letting up some. It may help too, if you always take it with food or after a meal. Sorry I couldn't be of more help.
Pat