I've had it suggested by an ENT (who showed that vertigo was actually treatable and manageable!) that I might also have a birth defect in the inner ears. Apparently, it's 'not normal' for 2-year-olds to report tinnitus and vertigo. The story my mother often told me was that, when I could form sentences, I complained that the room went around and my ears made noise. We got the vertigo taken care of serveral years ago, but the tinnitus never went away. At the time (and now) I couldn't afford further testing, but it's something to consider looking into.