I'm sorry about the shingles. I had it this fall and by the time they decided it was shingles and not a allergic rash of some sort, it was too late to take the Shingles medication. I had the rash for the full six weeks. While I wasn't sick, I was itchy. As for the snow, be safe. It isn't worth risking an accident just because it's Christmas. A Christmas dinner would taste just as good in the New Year when the weather has a chance to settle. You would also probably feel a lot better then.