dry heaves

I'm just--finally--kicking a cold and cough that has been around since Christmas. However, when I cough really hard I get the dry heaves. For instance, if I've been asleep all night with post nasal drip, I cough and cough in the am and then throw up liquid and phlegm. The other day, I came home, had a cookie, started coughing and threw up just the cookie, not my lunch.

Is this my Crohn's or just a bad cold that won't go away?

Never had any esophagus trouble in the past. Don't have burning--just pressure from the cough made worse by the occasional dry heaves of phlegm. Chocolate is really bothering me.

Any thoughts?

For me, cough usually means an introduction to flaring. I do not know why, I did not pay much attention to it.