Balance disorder while driving

I am frustrated that no one can provide an answer or Rx for my symptoms which have been going on for approx. 1 year. I am not dizzy. This only occurs when I am driving at highway speeds on roads that curve Left or Right. Seems to be worse on Left. I feel like my car is going to roll over or I am going to fall. MRI, Blood tests, hearing tests, dentist evaluation, Opthalmologist evaluation were NEGATIVE. I have tried low salt/ no caffeine diet, no ETOH, Meclizine , hydration. Nothing has helped. In fact my symptoms are worsening.
Any Ideas ?

[MMahon]

You may wish to see a neurologist if you haven't already done so.
You only have problems when driving at high speeds and no other times?

[ginger899]

Please excuse me for saying this, but it all sounds very dangerous. I know how hard life can be when you can't drive, (I know that personally because I live in the middle of nowhere and totally rely on my car!) -but please do think twice about driving until this is cured, or you have meds to control it.
If someone else can take over at the wheel...let them!