I know how you feel. I don't know about the sickness running through the body, but I have an over all feeling of just, YUK!
I'm always tired, and my neck is always stiff. Exercise/lifting weights always makes this worse for me too.
I went the adrenal fatigue route too, but that didn't help me. I just ordered Humaworm and I'm going to test the parasites thing as well, however I think what caused my fatigue is stress. I'm also doing acupuncture at this current time too. Keep me up to date on what you find... I know how you feel. All the blood work, tests, dietary changes, doctors visits... it's so hard being kept in the dark, and now knowing what's wrong. I tell my wife sometime I would just like to know it's something bad, just to know.
Keep your head up!