Do you have a heater on the tank? Goldfish like cooler temperatures, but without knowing what other fish you have, it may not be good for them to change that now.
It does sound like a swim bladder problem. Without knowing the specific cause, I'd suggest fasting (not feeding) your fish for a few days. This should help clear anything from the fish's intestines etc and allow for less pressure on the swim bladder organ. He may just be constipated and the swim bladder disorder is a result, but it could be more complicated than that. In any case, fasting should help. And don't worry about the other fish going without food for that period, they should be fine.
What do you feed your fish?
Can you take a photo of the fish?
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- Leah -
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