What parts of the holiday do you enjoy? Do you hate the shopping, but like to bake? Do you hate wrapping, but love caroling?
It might not work for this year, but try to figure out what parts you would enjoy if you weren't so stressed out and then try to eliminate the things that stress you out. If you have someone you are close to (spouse, family, friend) see if you can't compare lists, then try to share duties. Maybe you love to bake, and they love to wrap, so take care of each other's responsibilities.
Simplify, I had to do this 2 years ago, it has saved the holidays for me.
Now, if I could just figure out how to deal with my crazy extended family...