feeling sick

Hey has anyone out there ever had this same problem. For 2 days now I've been constantly feeling like I have motion sickness. I start to feel super hot in my head and upper body, then suddenly my temperature drops and will leave me with a banging headache. Hours later when my headache just starts to feel better the cycle repeats itself and again I have the same dam headache getting worse again. But even sitting still I feel sick, I try to eat but feel sick. I can't work this one out.