I had an upper respiratory infection 2 weeks ago. Influenza tested negative. Last week it transitioned into cold symptoms (congestion, sore throat). In the past 24 hrs I have had 2 coughing attacks where I couldn't stop coughing, choking, gasping, eyes watering, headache and pain down both arms. I got really exhausted and ached all over, once I caught my breath. Is it just a cold? or more serious?