I have an underactive thyroid, I take 100 mg of levothyroxine a day. 14 days into my cycle I get tired aching muscles, I'm miserable and my heartbeat when I wake up is so fast and I'm also sweating, this lasts until about the 3rd day of my period then I am ok again till next time.
My periods are now every 25 days and all this is interfering with daily life. My symptoms are so severe that I can hardly get out of bed. Am I going through the menopause? I am 40 years old!