Lately i get really cold, lethargic, and lightheaded before meal times. after eating i feel better for a few hours. not overweight, eat healthy.?

May be hypoglycemia: These symptoms could well be due to hypoglycemia, which is low blood sugar. To confirm this you should have your blood sugar tested when having symptoms and/or do a glucose tolerance test. The treatment is to avoid sugars/simple carbs and to eat more frequently. Whatever the cause, these symptoms warrant evaluation by a doctor. See http://www.Umm.Edu/altmed/articles/hypoglycemia-000090.Htm.

HYPOGLYCEMIA: Your glucose is probably dropping to a level that is causing you these symptoms.