Is Dizziness And Headaches Sign Of Vestibular Neuronitis?

41 y.o married white female with no children or occupation. MedH/o: hypothyroidism, hyperlipidemia, mild obesity, depression, anxiety and tension headaches. SH/o: ovrian cycts removed and renal stones removed (ultrasound). FamH/o: diabetes, hypothroidism, hyperlipidemia. Past tests: several cerebral/vestibular/spinal MRI s and CT s, EGD, lipid levels, LFT, BMP, mammograms and Pap smears-All normal. Mild/moderate alcohol intake. No tobacco/drugs. Meds: Lipitor, Levothroid, BCP, Seroquel, Lexapro, Valium, Percocet and baby aspirin. NKDA OTC: MVI. hot flash herb/vitamin pill, hair/skin/nails collagen & ARDM vitamins. No medication changes in over 3 yrs. Symptoms: 2-3 week h/o nystagmus (no change/onset/improvement with head or body movement). Usually last all day with occasional imporvement for 1-2 hrs on some days. No relation to sleep/wake cycle, food/liquid intake or activity level. --- nystagmus, tinnitus, hearing, sensation level changs, reflexes, snycope, emesis or migrane aura +++ nausea, burping, passing gas. No change in bladder or bowel output/activity. Mild tension headache (has been unchanged for 10 yrs. No change in chronic depression or mild anxiety disorders (both present for 10 yrs). No improvement with the addition of Tums, Pepcid, Benadryl, Pepto-Bismol, Unisom Nightime Sleep Aid, Maalox & Dramamine for several days. A similar event occured about 12 years ago. The episode lasted about 4-6 months. No diagnosis was made despite several specialists and many tests. Could it be Vestibular Neuronitis or a form of Migrane-Related Dizzines and Vertigo? Please help me. Thank you.