Is your girlfriend going to go see an endocrinologist or a gynecologist?
If she goes to the gynecologist, they mainly just give her the birth control pill to regulate her periods.
If she goes to the endocrinologist, they really don't have alot there "medication" wise. They have separate pills for the different side effects, but nothing to actually help the PCOS. Most often, they prescribe the birth control pill to go along with any medication given.
The best "medication" for PCOS is actually a healthy diet and exercise regime.
The possibility in having children is a more difficult one. If she gets her periods regulated and her hormones fairly straightened out, the possibility increases...however one of the more devastating side effects of PCOS is infertility. However, there is still the chance. Most likely you would have to go through doctor's care, and even then not always. Both my grandmas had the symptoms of PCOs (irregular periods, etc.) yet they managed to have children.
PCOS is a bad disorder, yet it isn't terrible. It's problem is mainly with the insulin levels, which effects the hormone levels. Just realize that she really has to keep a close tab on her weight, as the symptoms actually get mush worse the more overweight one becomes.
However, i never really heard of migraines and stabbing stomach pains as being a side effect of PCOS. How long has she been taking the birth control pills? I had really bad side effects from all the birth control pills i have taken, including stomach pains and head aches, which is why I don't take them =).
All in all, there isn't alot out there on PCOS. It only effects about 5% of the women population, though it is believed that there are quite a few more, they just never got diagnosed. There are support groups trying to increase the research and they are hoping to come out with a pill that stabalizes the insulin levels. Yet, as far as I know, there isn't a single pill which is used to help stabalize PCOS. Symptoms, yes, but the actual disease, no.
good luck =)
ta ta