In 2006 my roommate and I both got a cold, she got better, but I got worse after a week. I had a high fever, dry cough, a rattle
sound when breathing, cold in my throat, etc. These new symptoms lasted almost two weeks. Being a broke college freshman with no insurance, I just used whatever cough/cold medicines I could get my hands on, and I eventually got better.
Except for this persistent cough that has gotten worse over the years.