Yeah no big deal medically speaking. I know a few guys who have had it. As long as a doc signs you off and you don't have any symptoms it should be fine.
I know one guy who had the inner ear crystals knocked loose and that caused it. A simple epley manuver fixed it quickly (Google it).
Another guy I know got it and they think some sort of virus attacked one of his vestibular nerves and that took a few months of physical therapy and some medication to fix, retraining the brain to deal with conflicting inputs.
The docs have to look and make sure it is nothing serious like a tumor or anuerism, etc... but once they rule the big stuff out it's usually not too hard to fix.