i used to get that. felt as if the diaphragm was not working properly. only happens nowadays if i get slack with the magnesium intake - it's important for muscle function. shortness of breath is no fun that's for sure! in my case the ms connection was taking lots of vitamin d3 to help my ms, but i did not balance my mineral intake properly. once i upped the mag it was much better. none of this may apply in your case, but there it is
might be helpful. take care!
READ ME key info on nutrient targets - www.thisisms.com/ftopict-2489.html
my approach: no meds so far - just nutrient-dense anti-inflammatory whole foods, and supplements where needed
info: www.whfoods.com, www.nutritiondata.com