abby,

when i say my trunk i mean my back, check, stomach and neck muscles. when i'm not on mestinon i have a hard time holding up my head for very long. even with mestinon my trunk gets tired. for example, sitting up straight is a chore. standing up for very long is hard too. until i got on my current dose of meds, i even got tired if i ate too much because i'd be exhaused from using the muscles/energy to digest food. weird huh.

i walk pretty normal. but when i get tired i start to fall to one side. i also tend to start to trip...i guess i'm not lifting my feet up all the way.

one other thing i learned about a year ago is that i have a loose pelvis. the muscles in my hips are highly mobile. they pop and crackle all the time and i get spasms in my periformus muscle (a big muscle under your butt muscle) because it's trying to hold my pelvis in place. likewise, my shoulders are highly mobile. i can easily move my shoulders in and out of its socket just by contracting my muscles in that area. (hee hee that's kind of been a "circus trick" of mine since i was a kid, but i guess now i know why it does that).

p.s. i think the muscles that keep you from swaying side to side are your core muscles. your abdomen, the side muscles, and lower back muscles.