Hi there! I am sorry to hear he is feeling bad...it's that time of year!
To treat Coccidiosis, I use Sulmet. You can find at your local feed store for about $10. Mix 2 tablespoons in 1 gallon of water and treat him for about for about a week. This should make him feel better. Make sure that if you have any other birds that you treat them as well...it is very contageous! You should clean your incubator if you have one and make sure that it is disinfected after ever hatch. I lost most of my chicks last year from what I think was Coccidiosis in my incubator. They would hatch fine, and after a week (of healthy eating/drinking) they would just die with no signs at all. You should treat all your chicks at about one month to one and a half months of age for Coccidia even they appear fine, just to be safe and it starts them out on the right foot!
Wish you luck and hope he feels better!
Crystalchik