Yes, I would see a chiropractor, have some x-rays and get that neck fixed. What has probably happened is during the wrestling, that crack you heard was your vertebrae in your neck coming out of alignment, you ARE going to hurt big time until it gets fixed. Also, the yellow could be an infection, you may not have been entirely over your cold and the wrestling and the misalignment of your neck could have caused the cold to return.
I would get a head and neck xray to see what's going on.
For all you know you could have cracked or broken something.
I think CSF is clear but still it sounds a bit scary.
(CSF = cerebral spinal fluid)