I suffer from Vestibular Migraine too. Sucks big time. It can go on days despite taking medicines. I would get aura days before and would try to prevent it by taking medication early on - just like what drs usually advise, but still wouldn't work. It became even worst when I started taking oral contraceptives pills. Although my OB gyne advised me about it, I still chose to take pills because it might cause me more headache if I get to have more kids (haha).
I hope we get to find what can cure us. :-)
I had a former officemate before who suffered the same thing as you when she was taking oral contraceptive pills. She also got no choice but to endure it, because the pills were her medication (I just forgot what was it for, if I'm not mistaken it was because she was kind of suffering from hormonal imbalance).