Thank you dragnfly for writing about the progesterone has to do with the fatty lining around the cells in your brain.I think that is what my problem has been. I have the vibrating feeling in my head since July. Sometimes all over but mainly in my head, also vertigo blurry vision and migraines .I never lost my weight after having my last baby which I never had a problem with the other three babies and I have been extremely moody.I had my IUD out since Sept. 17th and my symptoms have gotten much better but still have them slightly. I have had two blood tests one for my thyroid which came out elevated so I am on med's. for that and one to see if I am in menopause and I am pre menopausal. I had that evil thing in for almost for years and never had a period. Since I have had it out I have been bleeding the whole time except for a week. My question is do you know if they can do a test to see your progesterone level?