Bad cold

I am suffering from the worst cold that I've had for ages. Currently my nose it totally blocked, so I have no choice but to breath through my mouth. Plus I have a cough which I strongly suspect is caused by a secondary respiratory infection. Am seriously thinking about self medicating with antibiotics and prednisone, as we are in Auckland for the weekend and I'm too busy to get to the Dr (And even if I went to a Dr, they wouldn't actually need to 'do' anything to diagnose me - I'd just be asking for antibiotics and prednisone and be out the door before they have even warmed their seat!)