Linda, you could just have early menopause http://www.health24.com/medical/Conditi ... ,16755.asp which can start before the age of 40. Unless there is a tumor I don't think I'd go for a hysterectomy.
I had one knife happy gyne who loved to give me 2 D & C clean outs per year (diagnostic curettes)
I've been going through menopause for the past 2 years with on again off again periods some times heavy some times barely there. Perhaps you should get a second opinion before going for a hysterectomy.
Jules, did the starflower oil help with the mood swings?