I am 15 years old and about 7 weeks ago i got a mild cold. Mostly I had symptoms of coughing (mostly clear mucus) but on one or two days I had a stuffy nose. Usually my colds don't last more than two weeks but this one seemed to linger around for ages. I was going to go to the doctor but then it started to calm down a bit. However, it was still here and although it was probably only around 2-5 coughing fits a day it seemed unusual for it to last so long. It was still here this week and yesterday i woke up with a blocked up nose. This has now cleared but I have a sore throat and keep coughing, much like I did last time. Do you think I could just have a very poor immunity system or could it be something more serious? This bears in mind the fact that I don't get colds that often, when I do they don't last for long and my immunity system cannot be that bad as I am naturally immune to TB.