I've been experiencing dizziness for several months now, with occasional ear pain. does this sound like a brain tumor or a sinus problem?

Get seen: This can be anything from a chronic ear infection to wegener's granulomatosis to an ear mass to acoustic neuroma to a nearby infection to lots of other things. Your physician will want to examine your ear and perhaps do some imaging studies. Don't self-diagnose something deadly yet, but do get seen now.

Not brain or sinus: It sounds like a jaw problem. Spasm and inflammation of your jaw joint can cause all these symptoms. Do you chew gum? Do you grind or clench your teeth? Try a soft diet, antiinflammatory medication, ice to your jaw joint and consult with a dentist.