One of the things that occurs with emerging T2 diabetes (and may be happening in your case) is that as your body becomes unable to produce enough insulin, you get reactive hypoglycemia after meals. Usually, your pancreas fills your islets with a reserve of insulin, this is released as your Phase I response when you eat, immediately counteracting any blood sugar surge. Then, any lasting blood sugar rise is dealt with by your pancreas pumping insulin out directly (Phase II). When we lose our beta cell function, our ability to store a reserve of insulin for a Phase I response can disappear and the result is that our response to meals is a Phase II response. Unfortunately, the Phase II response is "sluggish," slow to get going and slow to stop, so you can end up with a low 3-5 hours after a meal.
Low carb is an effective way of treating reactive hypoglycemia, but also, if you eat more protein in your meals, it will cause a blunted blood sugar rise 3-5 hours after a meal and tamper this effect. It is worth a try. Who could turn down steak for breakfast?