I've been sick with severe coughing and congestion w/ runny nose for about 10 days. Today I was actuallly feeling close to normal. Then tonite I started coughing and was experiencing severe pain in my upper left chest and side. This lasted for about 45 minutes and has now subsided substantially. We have no urgent care facilities open in our area. What caused this and will it be okay for me to wIt until tomorrow to see my doctor?