I honestly don't think it's gout.
It sounds like a stress fracture to me, or a bone spur. Ignore what the ER doc said, as he's obviously not got a clue. Hopefully your GP will have a better answer.
30 US Gallon Tank: 3 Goldfish (1 White Ryukin "Salt", 1 Bronze Oranda "Pyropus", 1 Silver Oranda "Argentum")
10 US Gallon Tank: Borealis the Betta, Assassin Snail, Various numbers of Pond Snails
4 Cats (Fenris, Tatum, 'Spoo and Samantha)
Part-Time University Student
Part-Time Hospital Employee
Not enough time in the day...