How quickly did negative side effects happen for some of you when you first started to take Mestinon?

I started taking 30mg 4x daily a little over two weeks ago. I didn't really experience any problems at all. Felt pretty good overall. Could feel a significant difference in my arms, only some minor improvement in by back and legs!!

On Saturday I awoke with an awful migraine like headache, this is not unusual. I went out for my morning walk, felt my usual fatigue upon my return. Put my legs up to rest... I ended up with such nausea and diarrhea by the end of the day and throughout the night. I felt a little better yesterday, but not quite my "new" Mestinon self. Still felt a bit under the weather today, went to a warehouse store with my sister this morning, by the time we were done I was lucky I could lift my legs to get into the van without help. Lifting my legs to get into cars or upstairs is one of my biggest problems!

Not sure if a should chalk this up to some stupid stomach bug, or if it might be a meication issue.

Thanks for your input,
Rachel