URGENT HELP NEEDED!! How do I help a fish who seems to have lots her buoyancy?

[Squirdle]

Wendy Whitefish is swimming upside down, sideways and in fact anyway but the right way! She can't seem to keep herself from floating to the top of the tank. This has just started today. What do I do? (I'm currently trying the pea thing mentioned on another recent thread, but trying to get her to eat it is proving v. tricky)

well she seems a bit better this morning. Still not right but a slight improvement there.

Strangely enough there was question about the same problem on QI last night (DH came up to tell me at silly ok clock to inform me he knows all about the problem and what to do So obviously he is Mr Expert this morning!) Anyhow, they said to stop feeding them for a few days and it should help. It's what someone has previously said about constipation! I have a constipated fish Will try it and see, but having read previous threads about fish on here am now worrying the small fish may get eaten!

I have a fish with fully functioning bowels again now Thanks for all your advice, Wendy is absolutely fine now!!

Twas the peas you know!!