Cough that came back?

About about three or four weeks ago I had gotten an itchy throat. I knew it was the start of a cold, and it was. Less than a week later I was weak, most likely running fever though I didn't check, and I had even fainted at a concert I went to (never before in my life had I fainted). I slept for a week straight and about three weeks ago I was back to my normal self. Then, two days ago the same exact symptoms started again. It starts in my throat, turning into a cough, then I feel the chest congestion a few days later, then it moves into my sinuses. The mucus is always clear, but this time around the symptoms came about much quicker and my cough is much worse. I went to the minute clinic a CVS just so I could get an excused absence from work and she diagnosed me with an upper respiratory viral infection. Could it be something worse because it came back? I have a bit of a shortness of breath now too. Sorry for typing so much I wanted to be as detailed as possible.