Question: what should i do when my blood sugar is low?
Answer: Eat something that has about 15 grams (g) of carbohydrates. ... 
Wait about 15 minutes before eating any more. ... 
Check your blood sugar again.
If you do not feel better in 15 minutes and your blood sugar is still lower than 70 mg/dL (3.9 mmol/L), eat another snack with 15 g of carbohydrates.