
Sounds like sugar really spikes your blood glucose, then after a while, the bottom drops out and you become hyperglycemic, which is too
low blood sugar. You should try to eat things that won't raise your
blood sugar quickly. That means avoid anything with sugar, white flour, white rice, processed foods, etc - anything with simple carbs, including fruit; if you're going to eat fruit opt for apples, pears and other very high fiber fruits.