Constant Lower Pitched Sound in Ear... Tinnitus?

[AnotherProblem]

I had always thought that "tinnitus" just referred to that high-pitched ringing I would sometimes randomly get in my ear for several seconds out of nowhere (that would fade), and assumed that anyone who has having tinnitus problems had that, but it wasn't going away.

But in the last couple of days, to accompany my hyperacusis and frequent full ear (air plane pressure) feeling that will result if I am exposed a while to certain sounds, as well as dizziness when I lie directly on the back of my head, I have developed this constant humming in that ear. I guess that's a form of tinnitus?