Had it a couple of times. Hurts insanely!
My GP didn't take my balloon-sized toe seriously, even while I was chewing his desk in pain, suggested the old classic of "rest" (amazingly, I didn't get "it's probably a virus going around"!!). I actually thought I'd broken it but couldn't for the life of me work out how. So I researched it on the net and changed my diet radically – as above, no tea / coffeee/ booze, cut out prawns and shellfish and red meat (diet does get a little dull), but what I think really helped was downing loads of water – when I started on that it went in about 24 hours. Could have been concidence, but when I feel the first twinges now, I hit the water big-time and it goes away.