Welcome to the Forum. I guess you haven't had any responses because we are unfamiliar with the medication you are asking about. Even though Metformin is a familiar oral medication for T2s, Galvus MET (Vildagliptin 50 /Metformin 500) is a combination I have never heard of. Is Vildagliptin a sulf... an oral med that presses the pancreas to produce more insulin? 500 mg of metformin is a beginning dose and wouldn't have much of an effect. Maximum is somewhere above 2,000mg. I hope a T2 will come along and give the exact maximum amount. They usually start new diabetics at the 500mg dose to avoid intestinal distress.
Please tell us more about yourself. Are you overweight? If not, then I would suggest you ask your doctor to give you a c-peptide and a GAD65 antibody test. If you test low on the c-peptide test, then your pancreas are not making enough insulin. If you test positive on the GAD65, then you are a T1 and not a T2. In that case what you need is insulin. 70/30 mixtard may be too much of one and not enough of the other insulin. And there is no way to adjust. You could ask your doctor to prescribe separate basal (slow) and bolus (fast) insulins so you can inject the amount of each that is right for you. We call that MDI (Multiple Daily Injections). That kind of insulin treatment gives much better results.