Do some research on Meniere's Disease or Meniere's Syndrome. The four classic symptoms are tinnitus, hearing loss, feeling of pressure or fullness in the ear and occasional vertigo episodes. After 13 years of flying for the AF, I started to have similar issues with my left ear. Over a ten month period, I had 7 vertigo attacks with nausea, vomiting, and diarrhea that would last from 2-4 hours. It was horrendous. I was DNIF'd and run through a battery of balance tests and MRIs. Visiting an ENT is a good first step, but I highly recommend that you insist on seeing a NeurOTOlogist (not a neurologist). They specialize in inner ear issues. I was placed on a diuretic (Maxzide), and all the symptoms went away except for the tinnitus and slight hearing loss. The AF then made me show 12 months of symptom-free history before I was returned to fly. Bottom line, this is a serious issue that you CANNOT afford to fly with, and if you fly with a crew, you would be endangering other people. However, try hard to keep the words "Meniere's Disease" off your medical records. Find a flight surgeon, and a neurotologist that will treat you for MD, but are willing to stay vague in your medical report with terms like "vertiginous episodes". Believe me, this road sucks, but you need to get help for this.