Feel better soon!
I haven't had a cold in 3 years. I was in the hospital 3 years ago for 2 weeks due to pneumonia and complications, and I've been paranoid of getting sick again so I'm totally anal about washing my hands and keeping my hands away from my eyes, nose and mouth unless my hands have been freshly washed and I carry a small bottle of hand sanitizer in my purse too.
The best defense against getting sick is to wash your hands.
Also avoid sharing your telephone with anyone because you don't know how clean their hands are, not to mention the fact that they have breathed on the phone and that same phone is near your own nose and mouth when you use it. If someone does use your phone, wipe it down with a disinfecting cloth.
People may think you are OCD, but I'd rather that than get sick.