I'm sorry you have such a fear, I know it's hard to cope with.

I have a degree of fear about the floor. I try to keep my floors at home as clean as possible, but mostly I fear that some sickness will be on my floor and my cats will catch it (a parasite or something). Medication helps decrease my anxiety/fear somewhat. Besides that, I just try to remember to breathe and I ask for the universe's help to calm me.