You might take a break from RPGs for a bit and just meet up with the group to play board games and card games for a few weeks or so. Three Dragon Ante, Poker, Magic: The Gathering, Risk, Arkham Horror, Monopoly, Chinese Checkers, Chess, Yahtzee!, or something else.
Or start GMing a simpler, light-hearted game perhaps, using a relatively simple system (or just plain different system), like Castles & Crusades, True20, Fudge, Burning Wheel, or somesuch. Maybe try Shadowrun 4th Edition, or Mutants & Masterminds 2nd Edition, or Spycraft 2nd Edition, or Traveler T20, or Classic Traveler, or Iron Heroes. Ars Magica or Harn maybe?
Or perhaps even OSRIC, BD&D, or OD&D? Or perhaps, if I may be so bold (and insane), maybe try RIFTS or Palladium Fantasy or Robotech just for kicks? Or even Rolemaster?
I might even suggest trying Exalted, except for the fact that my deep, deep, bottomlessly deep loathing of White Wolf knows no bounds.
Probably just try playing instead of DMing for a while.