I've had what I thought was a cold for nearly two weeks now, but I'm now a little concerned that it may have developed into walking pneumonia. It started with a sore throat and switched to a runny nose, but in the past few days it has turned into a nasty cough. I occasionally find it hard to breath and when I take deep breaths it sometimes hurts, but I have no fever. I also had walking pneumonia when I was four. It may just be post nasal drip, and I have minor asthma, so it may be nothing to worry about, but I thought I'd ask.