hi, first of all let me tell you that an already congested nose is very much sensitive ,even a small change in the smell of air can induce sneezing, so it is very important to treat a congested nose or running nose,go for total and differential count of white blood cells to rule out eosinophilia. you can take some anti allergic like levocetrizine, montelukast, zileuton orally. if your nose is congested then you can take nasal drop of decongestant like oxymetazoline or even steroidal nasal spray but you should not use these for more than 1 week continuously, once your symptoms are releived then get over to oral drugs only.try to avoid extreme condition like cold air, dust, smoke etc. thanks .