I have had migraine headaches for years. my last 3 headaches have come with facial numbness and dizziness, a new symptom for me. is this normal or should i be alarmed?

Alarmed no: If these new symtoms resolved, there is no need for panic, but you should let your physican know of the change. It may mean you need an exam and testing to make sure there is nothing else going on.

Migraine vertigo: One variant of migraine headache is migraine associated with vertigo. If i had a patient with similar symptoms i would want to re-evaluate that patient.

Don't be alarmed: You do need further evaluation. Please remember these symptoms are consistent with a TMJ problem, so you may need to look to dental professionals to identify and recommend treatment for the cause of your headaches, not just manage the symptoms. Dizziness (vertigo) and facial numbness follow the anatomical structures. I would have concern if the affected areas seems to be widening.

New symptoms: You should let your doctor know. Might not want to take a triptan medication or an ergot preparation until you get seen. There may be increased risk of stroke due to excessive vasopsasm of one of the vertebral arteries.