First of all, I would go get it checked by a doctor. Getting the correct fasting blood tests will get to the root of the problem.
Second, I have been "borderline" hypoglycemic all my life. I control it by eating as healthy as possible, but mostly by making sure I have something to eat every few hours. I eat 3 regular meals but have snacks in between - fruit, veggies, crackers & cheese, slice of bread with peanut butter, etc. If I am going out I make sure I have something with me - my homemade trail mix, whole grain crackers, things that don't need refrigeration. In the evening I make sure I have something that isn't sweet but more protein. Half a small sandwich, plain yogurt, popcorn.
I do my best to stay away from refined sugars (difficult in my line of work
), and get as much protein in as I can. But I really find just making sure I don't let myself get hungry between meals is very important.