Hi
Thanks for writing to the forum!
Migraine is a possibility you cannot rule out. It can cause nausea and dizziness. Cervical nerve compression due to spondylitis, canal stenosis, slipped disc, bulging disc etc is also possible. Internal ear problems too should be looked into. If all these are normal, then you would need CT scan of the brain. TMJ, temporal arteritis and trigeminal neuralgia too should be investigated.
Consult a good neurologist and rule out these possibilities.
Hope this helps. Do let me know if there is any thing else and keep me posted. Take care!
Trigeminal neuralgias can present like this.Consult your physician.