can be due to several reasons like a problem in the inner ear
, a issue with the brain, substance abuse
like alcohol or drug abuse
etc. There can be other causes as well such as benign paroxysmal positional vertigo etc. We would need a detailed history and exam to find out the exact cause.
If you have not been using drugs or abusing alcohol, I would suggest that you see your general physician for a preliminary ear and eye exam.
I hope that helps