What Causes Pain In The Upper Back Between The Shoulder Blades?

Hi, I have been sick with a head cold/cough and after I returned from jogging outside for about 10 minutes, I felt like I had a painful airpocket in my throat. It causes some pain in my upper back between my shoulder blades. I ate a slick of vegetable pizza about 1/2 hour before running if that might have an impact.
What can I do and should it go away? I don't have health insurance right now so want to avoid going to a doctor.
Thanks