Are you still feeling awful everyday, or only when you go long time without eating, as most people would?
To check if you're hypoglycemic, get a glucose meter (Target brand is the cheapest and works good) and check your blood about 2 hours after eating, or especially when you feel awful. These should be your numbers:
Under 70 mg/dl is considered low/hypo.
Between 90-110 mg/dl is considered healthy range.
Over 130 mg/dl is considered high/hyper.
If you're feeling awful and you numbers are over 70, you're most likely not hypoglycemic and if they are not sky high (diabetic), you probably have toxic hunger.
When I went on my veggie juice fast, my glucose was always normal, so I knew I had toxic hunger and not hypoglycemia.