I have had these symptoms for a week now and have ruled out having the flu. It started with my 2 days off me having to stay in bed from fatigue and exhausted body, slept all day both days. Woke up next day with all this energy went to night shift work worked most of the night then all of sudden I got this nauseated feeling in my stomach and my legs and arm muscled ached to the point I couldn't work any longer. I am a lining machine operator and on my feet for 12 hrs a day, have to remove and lift and replace liner on machines , sometimes it is heavy. Also have to keep the boxes moving on the rollers when they get full. Anyway, I only worked 2 days this past week and had to come home for aches in my muscles and nauseated feeling. went to doctor and did all this blood work and all came back negative. Though thyroid showed slight elevation so did a thyroid ultrasound today, no results back yet. So, I am looking for other ideas as to what might be going on. This past 5 wks my thyroid meds had been changed from 125mcg to 100mcg synthroid but generic brand, could the meds be the issue?