Cheratussin AC and crud

I have been coughing up the crud in the mornings and then in the evenings it seems like that I am about to have a heart attack because my chest hurts me so bad. I am still coughing like crazy and I still don't feel any better since they started me on this med 4 days ago.

I don't recall having any weird dreams or nightmares. I've been taken this syrup for 3 days now, when I wake up, a couple times during the day and before I go to sleep. It's doing what the site said, it's loosening up my mucus crud and I cough it up and spit it out. Mostly in the morning, like I'm coughing up a lung. I'm still coughing and I hope I get better soon.