This raised a red flag for me, there is a range of thyroid that is considered acceptable, but apparently, if you are getting close to the border of those ranges, you can have a thyroid problem that is hard to pick up on without further tests. There is a website I've heard highly recommended you might want to look at if you think thyroid might be an issue for you.

http://thyroid.about.com/index.htm

I'd be tempted to look into Dr. Atkin's Vita Nutrient Solution book and see if he has anything to say about PMS/PCOS and vitamin/mineral/herbal treatments before trying HRT. He became quite into vitamins and minerals and his books seem quite good (at least to me, who is fairly uneducated on the subject, so take that with a grain of salt! )

Good luck, I hope you find some answers.

Valerie