I don't have gout, but my dh suffers with it constantly. The dr. prescribed colchacine for it and he also takes concentrated cherry juice that he buys at the health food store.
He is like Sherrine about the diarrhea, but he has to suffer with it too. The reason he gets is so often is because he takes a mega dose of water pills for congestive heart failure and it leaves the crystals in his body. He is supposed to stay away from any meat organs such as chicken livers or beef liver and most red meats. He says it's the most painful thing that he suffers with so I can imagine what your going through.
Try the cherry juice and see if it might help.
God Bless!
Shannon