How can I treat low blood sugar?

4 reactive hypoglyce. Eat only meat or fish or cheese or eggs or poultry and low starch veggies, drink only water. In other words avoid all carbs, carbs will only briefly raise your sugar levels and then your Insulin levels. The fats in the meat or fish or cheese or eggs or poultry will act like a "log on your metabolic fire" to keep your blood sugar stable for hours without raising insulin.
You need a diagnosis. You need to find out if your blood sugars are really low and what might be precipitating hypoglycemia if you have it. Long-term treatment will depend on the underlying diagnosis. Please see your doctor.