Yes, dizziness is a sign of diabetes - low or high blood sugars. But, it also is associated with a number of other health issues that only thorough testing can uncover; a stroke, balance disorder, inner ear inflammation, a tumor and so on. Go see your doctor for proper evaluation and treatment. Good luck -
Could be. However, it's typically associated more with low blood sugar than high. Diabetes symptoms include (but are not limited to) blurred vision, increased thirst, frequent urination, and fatigue.