I have type 2 diabetes how do i know if my blood sugar is too low? i'm only allowed to test once a day.

Don't trust symptoms: Symptoms are extremely unreliable. Most people cannot tell what their blood sugar is, although they all think they can. Only trust your glucose monitoring unless it's unavailable. You can test as often as your doctor authorizes. Talk with them. Don't let your insurance company control your health and disease!

Hypoglycemia: Hypoglycemia can be a very troubling, even dangerous complication of treatment. But your risk may be very low. Some diabetes medications (eg. Glipizide, insulin) can cause hypo, while others (metformin, actos) usually don't. If you a1c is high, then you are probably not getting hypo. Hypo usually causes symptoms that you will recognize: sweats, palpitations, headache, confusion. Talk to your doc.