Hmm-can you use those motion sickness patches? They tend to work on inner-ear as well as nausea, since the balance-out-of-whack is what causes the nausea, from what I understand.

And I've had that exact thing happen to me! I was falling asleep on a car ride; we stopped, and I shook my head to wake myself up, and LITERALLY GOT A CASE OF BED-SPINS (without the bed, of course, and without one drop of alcohol!). My eyes wouldn't even hold still, my equilibrium was so fucked up! It scared me half to death.