That sounds like you may have anemia not quite sure you might just want to purchase your own glucose testing to keep up with your sugar level. I just started taking prenatal vitamins, daily multi-vitamins, vitamins b-6, b-12, calcium, vitamins C and E if you would like try Geritols it has iron it builds your blood up or 3 SSS tonic believe me I use to have Anemic especially when I was pregnant and after pregnancy. I'm hoping this will shed some light for you.
Lots of things can cause what your describing from low BG to low blood pressure when you get up.
Diabetes is a disease about Blood glucose (BS) control. The ONLY way to tell if you have it is with a BG test.