The easiest way to treat the frog is to put him in a plastic container (like Rubbermaid) about 3 gallons in size. Put a gallon of conditioned water with about a half-teaspoon of epsom salts. Water temperature should be about 72 degrees. Dissolve the salt before putting the frog in. Don't put anything else in the container. Punch some small holes in the lid for ventilation. Leave the frog in the bath for 1 hour each day until the bloat is clear. Replace fresh water and salts each day. If the bloat isn't cleared within 10 days, then there isn't much more you can do. Don't feed live food. I suggest Tetra's Repto-Min frog pellets.
Watch for any unusual skin discoloration which could be as sign of bacterial or fungal infection. Usually the salt bath will take care of this problem too.
I understand your frustration. Be patient and most likely things will go well for your frog.