I Had Atypical Pneumonia Was Given Arthymycin (sp) Two Weeks

I had atypical pneumonia was given arthymycin (sp) two weeks ago. I went back to drs this past Tuesday cuz my ribs hurt and I though I pulled a muscle. the Dr concurred and was told to rest and take motrin. just today I was coughing and I felt a pop in my ribs....severe pain, hurt to talk and move. sometimes when I move I feel more pops.