The Fatigue

Does anyone else feel like the constant nausea just zaps all of their energy? I seriously feel like I have the flu constantly. I walked around a festival for three hours today and ever since getting back home, I just can't seem to function. The nausea is constant, I can't even sit up without feeling like I'm going to pass out, I've got a headache, and my body temperature is all over the place. Deep chills if I'm uncovered, sweating if I'm covered. This part truly sucks and I can't wait until I'm not feeling miserable all the time.