My left ear is plugged 80% of the time. I went to a ENT and they don't know why. I can't hear very well and I do have 4 sets of hearings aids-?

Get Better Help. Hearing involves external ear, ear drum, middle ear, cochlea, brain stem, brain & mind; increasing complexity out to in. Problems occur in any or all levels. Any competent ENT focused on problem solving (not just what is common/easy, paid by insurance) should easily be able to help you sort out the level(s) with problems. Yet remember, the person in charge with most vested interests is you!