No, don't email anyone (with an exception maybe being the graduate school itself, not the specific program or your PI). Better to just leave that alone. I totally understand what you're going through, it isn't a great feeling. Taking time for yourself is fine. Let me suggest going out and doing something active... something you enjoy. Try and get yourself in what Dr. Csikzentmihalyi calls "flow". Get your mind off it and know that you've done everything you can do. (Wiki link)
Good luck and take a breath!