couple hours before i started my menstrual i felt like i had the flue. The next day when i wiped i had a clump of dark blood almost black with a thick layer of skin; yellowish flesh color. I do have hashimotos, chronic fatigue and fibromyalgia but have never experience anything like this. i am also 43. i have always been healthy and very athletic and in shape until the past 3 . My first symptom 3 years ago was and still is a burning in my throat near my thyroid. What new ailment do i have now? Endrometriosis?