Remedies for stubborn attack?

Anyone have any thoughts on how to stop a gout attack that goes on longer than
usual and doesn't respond to the usual drugs? In the past, Prednisone has
stopped my attacks within a couple of days, but this one has gone on for over a
week now. Oddly enough, it began right after I started using Montmorency cherry
juice as a preventative!
Thanks, Irwin