When I cough my windpipe gets hurt or something and I can't breathe?

I have had bronchitis for 2 weeks, and it is now the 3rd week and it is settling down. But I have this cough still, sometimes it's hacking, sometimes it's not. But, whenever I have a hacking cough mucus gets caught at the back of my throat or something and when I cough it hurts, and I try to breath in but it sounds like a huge wheeze and I can't breath, I have to run to a tap and chug water to clear my throat/windpipe. I've been to the hospital to check my chest and throat, and they said it was fine. Are there any remedies I should use for the mucus? Anyone know what happens when I can't breath? I wouldn't know, but maybe the mucus gets to my windpipe when I cough.