The holidays can be a bit stressful for many.  Stress is not good for the body as you know...so if you are feeling stressed, take 5 minutes or more (if that is all you can spare), and do some deep breathing, inhale and exhale for double the inhale time.  Focus on something that makes you smile.  Think about right now and not about all of the things on your list to do.
One moment at a time.  Deep breath....happy holidays.