New Year's Eve is a time when calendars, dates and numbers come to mind. These can be major causes of spikes for people with OCD.
Among Christians with the disorder, the Mark of the Beast- 666- can cause all sorts of anxiety. It shouldn't. First, with the crucifixion and resurrection of Jesus, Satan and all that pertain to him are defeated and utterly harmless to us. If that's so of the Enemy and his legions, how much more so it is of mere symbols for them!
Many Christians waste time trying to decode this and other symbolic numbers in Revelation. In fact, the numbers are a kind of code; in Hebrew letters do double duty as numbers. Bearing this in mind, it should be instructive that Neron Imperator ("Nero the Emperor") and Diocletian Imperator ("Diocletian the Emperor")- the names of the Roman emperors who sponsored respectively the first and the last of the persecutions, and the two fiercest- both decode to "666." Is there another enemy of Christ and His church who will arise, and whose name will also yield the same result when subjected to "Hebrew arithmetic?" Perhaps. But if so, he will still represent a defeated power, and can do us no more spiritual harm than Nero or Diocletian can today.
Christ has triumphed over all we fear- including the Antichrist, and even his boss.