Fever Question???????

I have a fever I believe. But heres the thing. Before i got this fever, I was running outside in the dark...Ofcourse ran into a clothesline and my neck got scd badly. Its really brused and I really can't move my neck. After of a night I got my fever. I've always been tired, It was hard for me to swallow or chew. My jaw/mouth can open but it doesn't open alot. Is it possible that my body is trying to heal my neck and thats why im having this fever because of my immune system? And what are ways to get rid of this fever?