You may be experiencing low blood sugar. Are you able to or someone in your household able to test your blood sugar when you start to feel dizzy and during the middle of your dizziness? This is the only to find out whether Glimperide is causing your blood sugar to crash. Other signs of low blood sugar are anxiety, drowsiness, fast heartbeat, a headache, lightheadedness, tremors, unusual sweating, or weakness. Contact your doctor and inform him/her of your discomfort with Glimperide.