Being a nurse who worked in the Emergency Department for over 16 years, I can tell you that this is absolutely normal for a lot of people. I call it the post-holiday depression -- kind of like post-partum depression ("baby blues"). If this goes on for more than a month, you should be checked by your healthcare professional (aka, MD). Give yourself a little time. Make a list of what you would like to do or what you have started. Maybe that will get you going. Good luck.