I have Hypothroidism and take a 75 mcg levothyroxine daily. I am starting to get the following symptoms - I can feel fine then all of a sudden I start to sweat, get headaches, fuzzy head, feel like I am going to pass out, generally start to feel unwell and just want to lie down and sleep. I also get a lot of joint/muscle aches. I was tested because my sister has the condition but I have never really had any symptoms so i´m not sure if this is thyroid related. Any advice would be appreciated please. Thank you.