Just diagnosed hypothyroid but my glucose drops to 70-50mg. have symptoms of hypoglycemia 2-3 hours after eating but my doc said my bloodsugar was ok?

No: Treat your hypothyroid with synthroid (thyroxine) till your thyroid is stablised. But till then increase you sugar intake so your blood sugar is above 100 . You will feel better.

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.