What Causes Vibrating Feeling In Ears?

Hello, I m looking for some advice about an issue with my right ear. For about 2 months now I ve been experiencing a low rumbling/vibrating feeling in my inner ear. Feels like a twitching muscle almost. It comes and goes throughout the day, in 15-30 second intervals or so. Sometimes I ll get a whole hour of on and off rumbling, other times I don t feel it for most of the day. There doesn t seem to be any rhyme or reason. I feel a bit of pressure and some mild pain around the area occasionally, but not always and very mild. I m otherwise healthy, 28-year old female with a clean medical record.