It's the Most Stressful Time of the Year

Strange how at Christmastime, when I'm supposed to be beaming with joy, peace, and Yuletide cheer, it's quite the opposite. I'm tired--exhausted actually--cranky, sore, busy, stressed, and slightly overwhelmed. As hard as I try not to let holiday festivities (gifts, cards, parties) become a burden, it's happening. I find myself growling at my mom when we're out of ribbon, or bursting into tears because I have too much to do and not enough time. No matter what I do to try to avoid this (ex. slowing down, planning/organizing, praying, trying to keep focused, deep breathing, etc.), nothing seems to keep the Christmas chaos from happening. Any suggestions?