Jeff's a brass player, and sometimes he can't get a full breath...he says it's because his diaphragm (the muscle sheet under your ribs) won't expand all the way all the time. It's an involuntary muscle, except for when you really want to fill up your lungs, you suck in and the diaphragm moves south...so this could be an MS thing. Try pushing your gut out when this happens, that can release the diaphragm, too.
Do you have any allergies? That might be another explanation. Jeff's on a sneezing jag this week....he's letting 'em fly right now.
Yeah, life with MS sure can be a puzzle, huh?
Husband dx RRMS 3/07
dx dual jugular vein stenosis (CCSVI) 4/09