I get this from time to time - dizzy, lightheaded, nausea, fatigue, sweating, disoriented - but mine seems to be related to a drop in blood sugar, which is easy to remedy. My father had Meniere's disease later in life, and it affected his hearing as well as his balance.

If I were you, I would definitely consult your doctor about it, to see just what is causing it and how to correct/manage it. You don't need to be hit with a dizzy spell while driving your car - NOT GOOD!