Doctors warn us to take extra care of our health around the holidays. Research finds our risk of having a heart attack jumps 37% on Christmas Eve, and they're most likely to happen around 10 p.m. right after dinner. Dr. Christopher Kelly and Dr. Marc Eisenberg, authors of “Am I Dying?!: Should You Chill Out or Freak Out? A Complete Guide to Your Symptoms and What to Do Next,” join "CBS This Morning" to explain when you should worry about your health.