I am sorry to hear that you have been dealing with a blocked nose for the past 6 days and that it doesn't seem to be getting any better for you. I am happy to give you some of my initial thoughts about what might be going on, but ultimately I am going to recommend that you make an appointment with an ENT (Ear Nose Throat) physician, aka otolaryngologist
. This is because they will be able to take more of a medical history (which I am obviously not able to do), and they can perform a focused physical exam. They are also well equipped to diagnose and manage sinus diseases which is what you need. My first guess from the information that you have given me, is that you may be developing a sinus infection. Sinusitis, or sinus infections, generally start out with a viral infection. This is because the virus causes mucosal inflammation and blocks the normal flow of mucous. Obstructed mucous can result in bacterial overgrowth and ultimately cause a true sinus infection. Strictly speaking this generally takes about 2 weeks to occur, so we (otolaryngologists) do not generally treat a 'sinus infection' with antibiotics unless the symptoms have been present for at least 2 weeks. When you see an ENT they will be able to evaluate you and see if you actually have sinusitis. Best of luck.