ive had a few " oops" ( my one fish is a bit tempermental and only likes sub dominant fish ) Ive put the beat up fish in a hospital tank and treated the water with 1 tsp per gallon and an extra airstone. 10 % waterchange everyday if the fish does not right itself within 5 days there is most likely eternal damage. Epsom salt in the hospital tank may also help any kind of eternal damage such as the swim bladder.