I've been dealing with these choking issues for almost a year now. It's like I get this shortness of breath and try to fix it by coughing on purpose. It ends up in this kind of cough that feels like I'm about to vomit, but I never do, and nothing really comes out. No fever or anything, but I've been taking half a Montek LC tablet at night, and it's not really doing much. What could be going on with me?