Wow - you MUST really have a good doctor! I have been in contact with a lot of other women with PCOS and it seems to be difficult (for whatever reason) for us to get doctors to order insulin levels checked. That's great.
All of my GTT's have come back within the normal range also. But, even though they are normal #s, the pattern of the "spike" is not. My glucose level never went as high as they anticipated it, and the final draw was always lower than where I started after fasting. This explained the "crashes" I experience, even though everything appeared normal number-wise. I am not on glucophage, because I tend to shy away from meds if I can keep from them. The GI side effects sound like a little more than I care to deal with. I am attempting to control my symptoms with diet and exercise. If you do a web search, you will see that low-carb diets are really encouraged for PCOSers. It seems that if we keep glucose and insulin levels somewhat constant, it really helps with the hypoglycemic and "moodiness" issues. I am not sure if you have any other symptoms, but the Pill is also encouraged to regulate your period and may help with acne, hairloss, and facial hair, if those are problems. Spironolactone (not sure if I spelled that right) is sometimes prescribed for hair also. Other then that, there isn't really any treatment. There are studies being conducted all the time to try to formulate a more effective treatment.
My doctor referred me to a dietician who worked with me to set up a diet plan. I have a lot of weight to lose, but at this point my primary concern is keeping the hypoglycemia in check. It doesn't work out too well with 2 small children and school full-time, when you feel like you're on the verge of passing out or needing to sleep for 15 hours a day!
Basically, I try to keep carbs to less than 50 grams for each of 3 meals, and fill in with high protein snacks. It is also important for me to have a protein to balance my carbs in meals.
If you'd like more info, just let me know. Since this syndrome effects everyone differently, I try not to make blanket statements about what would help, but am happy to offer my experiences.