First of all, remember that when someone in the office says that they have a virus OFTEN others follow suit. Whether or NOT they are actually ill. It's an easy way to get out of work and NOBODY is going to question it.

That being said, if someone else is sick, so what? That has NOTHING to do with YOU! The idea that sv* germs are crawling on every surface is totally in your mind. You went overboard with the spraying, but not that you've done so you are pretty much guaranteed that you aren't catching it. The ONLY spot that I think you should be 'somewhat' concerned about is the bathroom, but I am 100% SURE you've already cleaned it. Am I right? With as worked up as you are I think you can go to work confidently knowing that you aren't putting your hands in your mouth.

Go to work, let go of the anxiety. Everything is going to be FINE!!!!