I don't know how long he was there--no more than 45 minutes (that's reassuring

). When I came back, he was gone, long story short, he was up the filter intake tube.
His fins look like they went through a shredder. All of them. He's a crowntail. He's moving his fins/gulping for air like he's obviously exhausted.
I've got him in the cup he came in...
Should I set up a "hospital" tank? If so, how big? He's usually in a 10gal. and I don't think he'd be able to get from the bottom of the tank to the top with how tired he is. He does have a betta log...
Aquarium salt to prevent infections?
Water temp is at 80... change it?
I'm freaking out so any advice is welcome!!