Hi again Mary!!! (You haven't been calling!!!)
Hmm, I would do 100% water changes daily (keep his water at 80 deg. and EXTREAMLY CLEAN!!!!)and add pre-mixed Aquarium salt to the hospital tank for another ten days. To help with treatment, you can add the Betta Revive as well and what I do to help heal the fins is add twice as much water conditioner with every water change (Instead of one capful, two).
As for the hospital tank, do u have an old rubbermaid/Sterilite plastic storage box lying around? They r of decent size for a hospital (I LOVE MY 5 gall STERILITE) and easy to clean.
I hope this helped a bit. Sorry i couldn't help previously, that formula was for mild cases. This is severe. i will pray for u two... (FIGHT ROGER, FIGHT!!!!!!) And call me asap!!!!!!!
- Dead Sunlight