Um...I think you were right, Your fish may have Swim Bladder Trouble.
Do you have another tank? Because any fish with a disease should be isolated in another tank or bowl apart from the healthy ones. Try cleaning 25 % of your water in the tank. And did you treat the water before you put your fish in the tank? Does your fish go up to the surface for air or his gills move very fast? Anyway, I wish you the best of luck with your fish!
For medicine, I use Mela Fix. It's a treatment that you put in your water. It comes in a blue bottle and if you have a Wal-Mart, They sell it there.
