I'm a 27 y/o female, a mother of 3 with hypothyroidism. I'm currently taking 0.50 mg levothyroxine and iron everyday. I was feeling fine before, until yesterday. I've been feeling very nauseous, bloated, having distended abdomen, back aches (similar to menstrual cramps), which radiates to my shoulders, and a stiff neck. I used the home pregnancy test, and it came out negative. Besides my hypothyroid problem, can you please explain why I have these symptoms?