What could i have?

im 12, and started
feeling sick last night. Right now i feel horrible!

*whole body sore, achy, weak -even fingers, legs, arms...
*my neck feels like its going to explode, and a little sore...
*extreme headache
*WORST dizzy feeling ive ever had. Can barely walk :\
*stuffy nose
Flu
Mono
Food poisoning

If it persists then go see a doctor

I hope you feel better soon.
Have you started your period yet? Your body is probably just gioing through some
changes. Or you could just be getting sick or some type of virus.
mono
sounds like you have the flu i had it this year and felt the exact same way
I'm sorry to say but, your dying.