Getting a cold is a lot like being in denial that you have an addiction. One tends to use a lot of defense mechanisms to attempt to convince oneself that in fact, one is not getting sick despite all evidence to the contrary.
In the early stages, one usually starts out with outright denial. Nope, not getting sick. This sore throat is because of dry air. Boogers? Must be something dusty making my allergies flare up (not allergic to dust, but hey whatevs...) Cough? Swallowed wrong. Headache? Thanks, kids. Keep screaming.
Projection can rear it's ugly head. "I am not sick, but holy hell you look like crap". You can intellectualize your cold. "This is a virus. I can't take any medications for it. It has to resolve on its own." You can rationalize it to death (well not literally. If you did that, you would get better since the virus would die...) "I must be getting sick because I am so stressed".
You then move on to regression. You want to curl up under the covers and cry for your Mommy. You want to whine and be cranky. You want to be tucked into bed for a nap and spoon fed chicken noodle soup. Essentially, you regress back to your two year old self.
Next comes the anger. "GODDAMMIT! We have immunizations for everything else; why not the cold!" "I want something to fucking make me feel better RIGHT NOW!" "Curse my great idea to have children who will go to the cesspool of germs otherwise known as school and bring back all kinds of communicable diseases!"
You get to the point where you can't remember what it felt like to be healthy. You become firmly convinced that you will never get well again, and slowly resign yourself to the fact that you will be miserable for the rest of your life. You frantically consult Dr. Google hoping against hope that a cure will magically appear. Life revolves around the color of your boogers and the debate over whether you will need an antibiotic or not.
You decide that this must be bad karma for things done wrong in a previous life and resolve to go forth and sin no more. Just when you think that you are just going to die....you get better.
Unless you are me and are taking medications to suppress your immune system. Then secondary infections take one look at you and think "Free buffet! All you can eat!"