What is going on with me?

I've been coughing for a few days now. It was a dry cough until yesterday. I started losing my voice, and it's like with the voice loss came the increased, now productive coughing. I'm steadily couching up mucus. It's a bit difficult to breathe. Nothing that I can't handle, but sometimes when I breathe in there's this weird vibration type feeling on the left side of my ribcage in the back. I'm uming it's coming from my lungs since it happens when I breathe. Right after I feel that vibration I always go into this coughing fit that lasts so long that I'm gasping for breath. I don't feel physically sick and nothing's wrong other than these symptoms. No fever that I've noticed. Nothing. I'd normally just let whatever it is run its course, but I'm starting my summer babysitting job on Monday and if what I have is contagious, I really don't want to bring it around the kids. Does anyone have any idea of what's going on?