hi i keep having low and high BS reading i take lantus 25 u at night and i use humalog i have a sliding scale and i am also on metformin 850 mg 1 pill in the day and 1 at night yet my BS readings are still either way high 350 or 398 ml/dg or way low like 47 or 49 ml/dg does this happen to some one else and if it does what do you do when this happens?