Stop feeding. Follow the instructions on the JPC box. You may need to repeat the treatment again.
Once you have done 2 rounds of JPC, try feeding a tiny bit of Blood Worms soaked in (active ingredient in JPC and many other mediacations). If he still doesn't eat, don't keep feeding.
Sadly, most times this means death to EBJD's unless caught right away and treated immediately.
Adding Epsom salts help but don't crank the heat. High heat will stress the fish and you want to have the least amount of stress. I would leave your lights off too.