The reason you feel better after eating carbs is that they are bringing up your
blood sugar. That is how you treat a low
blood sugar especially if you are a diabetic.
Since you have had a severe low, I would suggest that you ask your doctor if you should have a prescription for glucagons. This is a shot that gets your blood sugar up. Most EMTs and ambulance crops do not carry this drug.
I hope this helps, Lease check back with us again.