"Knocking" Sound/Feeling in Ear

Beside tinnitus, I get a "knocking" sound, more of a feeling, it's been happening more frequently the past few days. It happens in one ear or the other. Maybe it's that bone thing I've read about, at least I hope so. It is not painful, but it is noticeable does case some anxiety.

My hearing changes slightly also, by dropping a bit, but after a while it sort of restores itself and is not noticeable.

I'm not ready to go for any tests with an ENT right now, I went to several last year for standard tests, when I first had the tinnitus, and they didn't find anything. I did not have an MRI, the doctor said it was probably unnecessary. I am thinking that perhaps these symptoms are due to barometric pressure, as we've been having hot and humid weather.