I can relate to this problem. I suffered from a severe bout of dizziness about 4 years ago. Vestibular rehab did not work. It was terrible for a month. Then I recovered slowly. But I have not felt right since ten. I suffer from dizzinness every now and then. There are moments when I feel perfectly fine - then it comes again - causing anxiety. I find reading and concentrating very hard. Homeopathic tabs "Vertigoheel" seem to provide some relief. Smell of mint oil also eases it a bit. Please try. I wish you the best.
Have you considered a neck problem? Sometimes I get woozy from a neck problem I have and it lasts a long time.
Have you had vestibular rehabilitation therapy (VRT)? It can be very helpful for getting people feeling better after damage to the vestibular system.
Ask your ear specialist for a referral to a physical therapist who specializes in vestibular rehab. Or check the lists at www.vestibular.org.
Nancy T.