was not sure if you were able to get him out or if that was part of the question, how to get him out.
would add salt. one heaping tablespoon per every five gallons of water. also add an antiobiotic designed to treat external illnesses. the salt will help with his respiration. stress can cause the fish's gill function to become hindered. turn out the lights for 24 hours. don't offer food. you will not starve him. fish can go for a few weeks without eating.
is he alone or are there other fish in the tank? how big is the tank?