Whats Wrong?

Before I set up an appointment with my doctor, i'd like to have some ideas about what I might have. Heres a low down:

it started with a cough about a month ago, and almost every day for 2 weeks, I have been coughing so hard that I actually end up throwing up, and afterwards, I have major difficulty catching my breath.

I have been unable to do any sort of physical activity as a fear of coughing and having another one of these "episodes". Its weird. I thought it was just a cough until now, since it hasn't gotten any better. I've never heard of something like this.

I havn't lost any weight due to this, and I am not overweight. I am usually very healthy and I thought this was just a routine flu. Its not.

Please, I need some help, i'm sick of this. Just a few minutes ago I was rough housing with my dad and I had to run to the bathroom to throw up. I didn't even feel it coming, I knew it was going to happen. And then I couldn't breathe and I had to calm down as I struggled for air.

Please, tell me what's wrong. Thank you.