Hi welcome to Health care magic forum, Most probably it is the syncope
caused due to exposure to the rays of early sun, gastritis
, hyper tension , hypo tension or middle ear infection
I advise you to consult a physician for diagnosis and conformation. For conformation you may need to get H.b, Dc, E.S.R, R.B.S, X ray
Besides i advise you some diet recommendations Avoid taking chellies, spices, to avoid gastritis, fruits juices, ice water to avoid rhinitis
Your sugar level is normal so you need not think of diabetis. If you are already diabetic and using drugs there may be a possibility of hypoglycemia
due to excess drug in the blood, or less intake of food. Wishing for a quick recovery and no recurrence, and thanks for calling.