How can i tell if my blood sugar low or high?

Try drinking juice: I assume you have symptoms (? feeling weak or dizzy) which you worry are related to your blood sugar. If the problem is low sugar then drinking 6-8 oz juice should relieve symptoms in 10-15 min. For high sugar the most common symptoms are drinking and urinating more than usual. You could purchase a BG meter and test strips if you want to be sure or borrow a friend or relative's, or see a doctor

Check your blood: sugar with a glucometer.