Your symptoms are suggestive of hypoglycaemic episodes i.e when your blood glucose levels go down. I suggest you get a full sugar profile - fasting (at least 8 hours) blood glucose and 2 hours postprandial (after food) blood glucose. If these come out normal, then other possibility is of gastritis
. For gastritis you can take Ranitidine
. If your blood sugars are high, you need to visit a doctor personally for diabetes
All the best.