Not to give you a false sense of hope, but late last year I was in almost the exact same situation, and over the course of probably six months it slowly went away. In my case, my hearing suddenly started sounding muffled and a week or so later I had pretty bad tinnitus in only my left ear. If I covered my ear shut, it was really noticeable. Had wax removed, did all sorts of tests with an audiologist and ENT, lots of medication (prednisone, steroids, antihistamines, etc), and ear/jaw exercises.
Almost a year later and I'm still having problems with my ears crackling, popping, and feeling like there is something sticky in them when I eat, flex the muscles around my ears, or open my jaw wide, but the tinnitus is for the most part gone. Basically, I've also had chronic congestion for over a year and my improvement seems to have potentially coincided with my treatment of that. But I've literally seen like a dozen doctors/specialists and still no concrete diagnosis. So far it seems like just really bad eustachian tube dysfunction, but I'm not fully convinced.
Besides a pretty much constant source of noise to help train your brain to forget it, one thing you might want to try is massaging your ear. I don't know why, but if I massaged the outside of the ear canal by slowly moving it in circles with my finger, I would see temporary relief. Had to do it for literally hours a day, then less and less until it's not necessary anymore, but I still do it usually for at least a few minutes before and after sleeping.
