I agree with @ajayram. Plus, you can opt for ayurvedic medicines. They don't have any side-effects. i'd say go for Prakruti JiyoFresh medicines. They are good and effective. Cetel PR Liquid can sort you out. Try it. Keep us posted for the updates
You can take lot of precautions if your sugar level is on borderline:-
Do lot of exercise
Reduce your weight
Change your eating habits
See your doctor more often
You can even go for ayurvedic and homeopathic medicine that would control your blood pressure
When your blood sugar is on border line, then it is always good to control your blood sugar level at that stage itself with proper diet plan and with regular exercise. Have regular checkup to see your sugar level. You can even try for GlycaCare tablets containing herbal extracts and nutrients that would help you keep your sugar level in control.
When your Doctor said that you were borderline, did he make any suggestions about controlling your blood sugar with diet and exercise? If not, either see another doctor, or a diabetic educator.