Question: I have been suffering with a cold for five weeks and am getting tired of it. I am in good general health, average weight and had may colds over the years but never anything like this. Is there more going on than "just a cold"?

Thank you Dr. Gurabardhi for your advice. For the last two days my temperature has been around 100.4. I believe that I might have been infected by 2 or 3 strains of the cold virus over the course of 5 weeks to make the symptoms last that long. The fact that I now have a fever leads me to believe a flu virus might be at work within me. Your comment "A lack of immune system can trigger the symptoms" concerns me. I have a complete blood analysis done each fall at my annual GP appointment and nothing is ever out of the ordinary. I would be having this discussion with him now but the first available appointment is weeks into the future. My other local option is to go to the hospital ER but I have already done that and was told I had a cold and sent home. After five weeks i believe there must be more to it. How do I proceed to investigate a bacterial infection or an immune system problem?
Thank you for your service, XXXXXXX Aardema