My best friend was on it a couple of months. She got so crazy on it she told her doctor she'd rather have a complete hysterectomy than continue to take it.

I completely agree. DH referred to it as my "psycho" drug. I asked him to pick up a prescription for me & when the lady handed it to him & he realized what it was, he gave it back to her & told her to bury it. He refused to bring it to me.
When I took it, it took a few days after to start. I hated taking it though. It was like PMS magnified 1000X!! I did a 7 day cycle and a 14 day! Not pretty!
I did a 10 day & though it worked, I would
almost compare the cramps to labor pains!
I have PCOS so very irregular cycles. Prometrium always worked better for me than Provera when I had DUB or no bleeding for a long time. Prometrium is also more natural, so the side effects aren't as bad (at least they weren't for me). Now I just stay on bcp so I know I will have a monthly period (i.e. no uterine lining buildup).
There must be alot of us out there with PCOS. I was on Prometrium for 6 months with no results (& no side effects either), which is why I was put on Provera. So, with no results on Prometrium (or BCP either!) and Provera destroying my marriage

, my doctor came up with the "perfect" solution - he told me to lose weight.
I mean, why didn't I think of that? After 10 months of sticking to a strict nutrition & exercise regimine (ok, I had a piece of birthday cake on DS's b-day & I ate mashed potatoes & dressing at Thanksgiving) & losing a total of 4 lbs., does he not realize that I want to be overweight?

I know that losing weight helps, but he also refuses to put me on met until I lose 20 more lbs. In other words - about 5 years from now!

I am still continuing to try to lose weight, but since my current doc is a fertility specialist & I've had my tubes tied, I don't seem to be much of a priority to him anymore. I do have an appointment with an OB/GYN who specializes in PCOS next month, so hopefully I can get back to normal.
I'm glad that Prometrium worked for you, I wish it worked for me - I had no side effects with it (but no results either).