hey there!
I have not been on TOBI long or often enough to notice any problems (I've been on it twice through out my life). However, after starting Colistin many months ago, I noticed my reactive airways get way worse. Colistin, while it completely treated my lung infection (no more fevers, etc.), it made me SO short of breath...and it would last through the night pretty badly. My CF nurse suggested I mix my albuterol with the Colistin instead of the sterile water. That has seemed to help much more than just using the albuterol afterwards. Hope this helps, you're not alone...the older I get, the more I notice bittersweet outcomes with meds.
P.S.
I tried Xopenex awhile ago, it seems to be everyone's favorite bronchodialator these days-it did nothing for me. If anything, it made things worse for me. So far, I think I'm the only one in the world who feels this way...to each his own, I suppose.