What Is The Cause Of Fatigue, Brain Fog And Muscle Pain After Having Hysterectomy?

Hello Dr. Oana, I m a 51 year old female who had thyroid ca. at the age of 22. I ve been taking 300mcg. of synthoid for many years. I suffer with chronic fatique, achy muscles, brain fog. I have also had a hysterectomy last year still have my ovaries though. I have concerns about being able to focus,I m gaining weight,and no sex drive at all. I read about wellness supplements by Byron j. Richards. the thyroid helper supplement. Do you have any knowledge of his products, and suggestions for me? Thank you for your help.