You're welcome. I hope you feel better. :-)
Make an appt. with a Neurologist and have him work you up. This pain could also be coming from either your head or your neck, but without having an exam, we cannot say. So call to make the appt.
In the meantime, when it's really bad, try laying down in a dark quiet room and rest and see if that helps.
You won't answer the question without MRI of the brain. It could be variety of reasons concerning lower part of the brain/base of the skull.