After i eat a heavy meal , i can't focus, i feel tired, and i head feels fuzzy. do i have diabetes?

Out of balance: Listen to your body. Eat 6 small healthy meals with 6 servings of raw or steamed vegetables and one apple plus 3 t olive oil, and small amounts of high quality protein at each meal and slow grains like quinoa, amaranth, buckwheat groats not wheat, corn, or rice. Sleep 7-8 hours, get 60 minutes of movement exercise spread out through the day. See how you feel. Read the will power instinct.