yeah that's what my friend's fish did. They kept on 'dying', floating on the top and looking horrid, then reviving, half heartedly swimming about the bowl (on their sides) and dying again.
They did it for days. Bloody things.
In the end I put them out of their misery and told my friend when she came in that they were properly dead when I found them.
I feel slightly bad about that. But is was deeply horrid watching the macabre life & death scene play out over practically a whole week.