@havasudan- there are many things that can contribute to the feeling of plugged, clogged ears, other than the obvious things. Sounds like you got all the tests that showed nothing. There are many different muscles in the neck and head. When these are tight, out of balance this can cause a feeling of pressure/disequilibrium of ears. I recommend seeing an osteopath/chiropractor to check your musculature in the upper neck, jaw, posture etc... Often jaw tightness can refer as ear pain/fullness. I’d be hesitant on balloon procedures, especially if you don’t know the root cause.