I've been having headaches for 3 weeks now.usually at the back of my head.neck hurts,legs also hurt. Fever a week ago.No appetite and vomits

[LDfalgui]

I went to the school's health service weeks ago and asked the doc about my headaches. She just told me to take headache medicine and observe myself. I did that for about two days only. She said that the headache might have been caused by getting exposed to the sun (but I haven't really been that exposed). After that week, I had a fever for 2 days and I started vomiting the foods I eat. Now that I am well, I still have headaches. My neck hurts already and I find myself losing balance often. My legs also feel tired everyday. My routine is the same as before but it's only now that it hurt me. I can't also stay up late til 2am just like before. I always feel tired and sleepy. I also noticed that I oversleep these days yet I still feel tired and in need of another sleep. It always happened that I wake up at 7 and I accidentally sleep til 8:30. I've also been losing appetite these days..and whenever I eat, I either vomit or just have the feeling of vomiting. I need your help.. I don't know what to do