I have LPR which I guess is similar to regular reflux but in the throat, and now that you mention it, it may be caused by 6mp. I never put 2&2 together - perhaps I had the LPR before 6mp, I really don't remember which came first. I also can't breathe but I never could breathe well so it's not that much worse than it was before 6mp.
en.wikipedia.org/wiki/Laryngopharyngeal_reflux