I've been coughing for 3 days. Dry and non stop. My cough is making it hard to breathe and takes my breath away. I had a chest infection 3 weeks ago.

Immediate Care! It appears your chest infection may not have been resolved or you may have a new chest infection. In view of the difficulty you are having breathing I suggest you go to an Urgent Care Center or Emergency Room immediately to be properly evaluated and treated. Chest X-rays and standard lab studies will probably be ordered after you are examined. I wish you well with your health!