With the discus, when they first exhibit the swollen belly and the head down, rear in the air sort of position, the first thing to rule out is bloat. Bloat can happen if they overeat dry pellet or wafers and after they ingest it, it expands quickly in their stomachs. I had a female do this all the time. She'd pig out on the algae wafers that I put in the tank in the dark for the plecs and cories. I'd find her in the morning unable to keep her balance. The epsom salts worked, and then she'd do it again. It may take a couple of doses for that one.
If you still see no improvement after another dose, then you probably are looking at swim bladder and with that, the chances of getting better are pretty much zero.
Just give them lots of fresh water changes for now. Observe their behavior over the next couple of days, notice who's eating and who's not. See if there's any cloudy eyes or flashing. But for now, let them destress and get acclimated to what must seem to them like "fishy heaven"! Good job!