Hi there I am 26 years old usually in good health but laterly I have found I feel tired all the time I have little energy levels. I have taken iron supplents and iodene supplants dispute having a negative result for thiroid disorder, I drink coffie and sleep average hours, but dispite this I still nap in the day and feel tired constantly. I am not over weight and my diet is normal consisting of meats and veg ect, I am averagly active. I suffer from head aches everyday and I feel in a low mood quite alot, my muscles ache too and I feel nausea often as well. I don't drink but I smoke and I have never taken illegal substances. I can't understand why I feel crap all the time its effecting my life now. Please help.