Thumping/drumming in one ear

It started about a week ago, I was walking my dog and suddenly I hear this rapid drumming sound in my right ear, twice, it doesn’t match my heartbeat at all, the second time it happened I covered my right ear with a finger and it’s gone. And since then I’ve been having occasional rapid thumps (3-4 thumps) in the right ear, maybe once or twice a day or sometimes none in a day, no common trigger, just happens randomly during the day. I don’t know why? When the thumping happens it feels like that ear is partially blocked like under water.

I’m currently experiencing slight dizziness due to bad postures from a few weeks ago, which leads to sore neck and shoulder, not sure if this could be related?