I'm having the same issue in my right ear due to eustachian tube dysfunction. Went to an ENT and had hearing test, hearing test results were normal. ENT gave me a fancy steroid spray to use daily, it's helped a bit but I'm going back in Jan to see if the issue has resolved or if it could be something else. Might be that I need to get balloon dilation done to correct the ETD. Idk if I have TMJ or not, will prob have them check when I go back.