CB, I clearly know how to take care of my bettas. I know extra water changes will help, I KNOW WHAT I'M DOING. I'm sorry for snapping, but have you ever thought that someone might know a little more than you?
His normal tank is a fully cycled 3 gallon that gets 2 50% changes per week. If my fish are in a hospital tank they get full 100% changes daily. I will be home tomorrow to clean his tank and will continue to change it daily until he is fit to go back into the 3 gallon, if he ever is fit enough.