Will changing eating pattern cure my hypoglycemia?

Yes. Unless you have type 1 diabetes, changing the diet will have a positive affect on low blood sugar. Eating protein only for breakfast, removing all sweets and artificial sweeteners from diet and eating small protein snacks every 2 hours usually keeps hypoglycemia under control.
For reactive hypogly. 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, then Insulin levels and then your sugar will drop again. 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 insuli.