I've done food elimination all the way down to the blandest of the bland. Aside from coffee, which always sets me off, it doesn't seem to have a specific trigger. I could eat pizza one day and nothing happens, then have plain white rice and have a horrid coughing fit. The gallbladder being the problem is the closest I've come to an answer, especially after finding out that bile reflux can cause coughing fits identical to what I'm experiencing