HELLO i AM ADIABETIC PATIENT TAKING ORAL HYPOGLYCEMIC DRUGS , MY HBAIC IS HIGH RANGING FROM 7.8-9.0, I OFTEN SUFFER FROM LEG PAIN/CRAMPS , & RECENTLY BEING HAVING SEVERE NECK PAIN, REQUIRING NSAIDS, GIVING MOMENTORY RELIEF. I am taking b12 tablets regularly. I was advised that neurobion tablet/injection may benefit me. If so how much to take & for how long