There are some vertebral artery symptoms at the bottom of the chart on this TOS page-
http://www.tos-syndrome.com/newpage12.htm

It can come from the c spine bones or from neck muscle spasms pinching the veins or pulling the bones out of alignment.
or it could be from ear/vestibular causes or a host of other things too.

I hope you find a good chiro that will do a thorough precise exam first and NOT just grab your neck and crack it. Keep away from those types.

mine is very precise about feeling for the placement of the bones - he only adjusts if he can feel a problem - and he also is familiar with soft tissue conditions too