My head hurts, why?

I know i’m going to end up at a doctor, but i’d like to know if anyone else has felt what i feel.

last friday i had a performance at school, and after i said my lines i squated back down with everyone in the group. when i popped back down my head started to hurt. the back of my neck was in pain, and my brain stated to hurt.

it went away after a day or so. and yesterday i performed again and it hurt twice as much. has anyone ever felt this?