I am sicker than I have ever been in my life. I've been sick since about November 20. I have pertussis, better known as "whooping cough." And yes, I was vaccinated when I was a kid. But I have learned that these vaccinations wear off, so by the time you are in your teens you need a booster. My shot wore off long ago, I never had a booster, and I was hit so hard that I spent two days in the hospital. I am recovering now but recovery from pertussis takes some time.
If you haven't had a pertussis booster shot, my advice is: run, don't walk, to your local medical center and ask for one. This was once practically eradicated and now it's going around. There are outbreaks in Ohio, Illinois, Texas, and California, and perhaps elsewhere.
Believe me--you do not, repeat DO NOT, want to get pertussis. Just take my word for it.