RN mentioned by link what was popping into my mind, Ménière's disease: http://www.nlm.nih.gov/medlineplus/e...cle/000702.htm My wife (non-diver) has a case that is mostly mild, and the primary symptom is ringing. Since you're experiencing symptoms that seem to relate to your diving, Ménière's might be off the mark, but the wife's symptoms become aggravated by any change in her sinuses. Whatever the case, I would take it slow. Diving while not 100% isn't going to improve the situation, but you know this already.
Additionally, you can have fun on dives that aren't two-hours long. Ever been spearfishing?

