@wayne,
hey. I also have a pregnant goldfish. She had the same "symptoms" as your ones. She was trown around around in the tank and couldnt swim properly. I took her out of the tank and gave her her own tank. She did lay her eggs afterwords, but now shes loosing her scales, I dont know what to do know...
Maybe your fish is also ready to lay her eggs. I have posted my question of what to do when shes loosing her scales , but no one seems to answer. Do you know anything about that???