What Causes Cold And Cough Along With Upper Abdominal Cramps?

I returned from a business trip last Friday and noticed that I had a stuffy nose and cough the next day. By Sunday I also noticed an accompanying constant cramping in my upper stomach. It felt like heartburn in the upper stomach and lower chest. I went to the doctor Tuesday late afternoon and they prescribed Amoxicillin, Loratadine, and Nasoflow. I have been taking them since Tuesday late afternoon. I m doing better as far as the sinus congestion and coughing are concerned, but I still experience stomach spasms and heartburn in my chest (although I must admit that I didn t start taking the Nasoflow until today). Please Advise