I Am Finishing A Fourth Round Of Antibiotics For A

I am finishing a fourth round of antibiotics for a lingering cough after pneumococcal pneumonia. I still have a cough and I felt like there was something caught on my tonsils that I was trying to cough up. The mucus is still slightly straw in color. I looked in my throat and saw what appears to be red blisters or spots in several places in the back of my throat. I am a musician with two concerts tomorrow. Any ideas?