I, too, have real trouble with IBS. I also have MAC, but don’t see a connection. I have read a number of posts that discuss the lung/gut connection, so asked my gastroenterologist what he thought. He said there’s a connection with many organs and had no real suggestions about what I might be able to do or take to help. He knows I have struggled with IBS since 2003 and it has gotten pretty rough for me. It bothers me daily and MAC doesn’t seem to interrupt my life except when I get a bad cold or flu. I do the saline and nebulizer every day as well as other cautionary measures to prevent a set back. It’s the gut issues that hurt my quality of life. I keep hoping I can find something that will help the bloating, gas, diarrhea, constipation, accidents, cramps etc. I wish I could suggest something to help you, but I’m also searching!! Good luck and keep us posted if you find help!