I have extreme fatigue off and on sore muscles and slight headaches, and a tender belly. I am a marathon runer and this is really effecting my training. It does not seem to be linked to over training. I was fine after running 13 miles the other day but feel aweful today and I didn t even run 3 miles yesterday. I eat very healthy tons of fruit and veggies, small fish, rice and a few sprouted grains. The majority of my food is organic and little to no processed foods. I do not rink, smoke, take drugs (only vitamins). I am trying so hard to be healthy and it seems like its too hard of a fight! What could be wrong?