fungus and swim bladder shubunkin

[Subshubs]

So I posted on here a little while ago about my shubunkin with fungus on his tail. We have been treating him with anti-fungal medicine and salt baths. At first,he appeared to improve but recently he's taken a turn for the worse. I think he might have developed swim bladder disease as well as he cannot rise to the surface or lift his head up. His tail is always above his head. Today he has barely moved at all and there is an oxygen pump in with him but when I turn it on he gets sucked down to it and cannot get away. I don't want to stress him so I've turned it off but it does mean that I can't get oxygen into his water. I've tried giving him some pea but he won't eat. I am desperate to cure him. Any advice?