Reverberates or echoing when people talk or if I have internal pressure change

I’m having reverberates or echoing when people talk or if I have internal pressure change like yawning, just before a burp, or movement of the jaw in a certain way. I believe it has to do with some kind of pressure change. I went to a cochlear implant expert, and he checked with imaging and said there was no fluids in the inner ear and that everything looked fine. He was unable to give me an answer as what was going on. I can flip my ear and make the sound appear. Right ear only. Not sure if it’s to do with tinnitus or my ear drum. Has anyone had this issue