okay for almost 2 months now i have been having headaches.The are mostly at the front or back of my head.Medicine doesn't help.

I've been having horrible chest pains and back pains.They never go away and sometimes they don't hurt aas bad but usually it makes me want to cry.
I feel nauseated all day wether i eat or not.

I feel as though I have a fever.I take medicine for this and it doesn't help at all.

I also have a really bad pain in my joints.Sometimes making it hard to move.

My doctor doesn't know why this is going on.
I'm 15 and a femaile.I have not had sex yet so i know i can't be pregnant or have any STDs
Help please