I agree with luckyorange. Maybe it's just a sudden urge like how so many teens wanna buy DSLRs to look cool. If it still doesn't goes off in a few days, then maybe Canon doesn't suits you as much as Nikon after all.
By the way what equipment you have for Canon? And any left for Nikon that you haven't sold? I'm not buying. Just asking
Look at his sig, quite a bit of equipment...
Blitz: if you are getting Nikon again, I suggest you keep your Canon as well cos I feel that you may want to switch back again in future...