What Causes Severe Headache, Nausea And Fatigue?

I m scared and I feel very sick. I ve have real bad headaches on the back of my head for almost a year now. I get really hot real easily and really cold. Whenever I eat I wanna throw it right back up. I m weak and feel numb. My eyes burn and ache and I feel like so sleep is helping. My. Mother told me I look pale