Tom,
Sometimes it is best to walk away from something in peace and with good memories. It is possible to continue something too long, to the detriment of your fun and personal relationships. So, give up the game ... at least for a while.
I think it might be best to think of this as a break. Perhaps after a few months or years, you might wish to find another group. Set down some rules, and stick to them. Insist that others take turns DMing. Also, remind people that you also have other priorities.
Take some time now for rest and relaxation. For the most part, the gamers I have meet have proven to be good people. I hope that you will at least visit this site, and perhaps return to the hobby. You will be missed, Tom. May your path in life be gentle and peaceful -- with very few potholes or roadbumps.