There is nothing much that you can do in the absence of the doctor but try giving him some hot milk or something hot. This may cause his nose to be cleared and thus become less swelled up. Other than that, stuff him in warm clothes. There does exist a likelihood that he has caught cold due to the cold wave that is present.

 A dog spends a lot of time with their nose near the floor or ground. A bee sting, spider bite or other insect that might be present can cause this. I've seen this with ours.

 Is there any lump there? If it is a lump or a bump then it can be a tumor. There are also chances of insect bite. But its wound should be there in that case. Few dogs are allergic of grass carpets and food additives. Apply petroleum jelly on that area. It can heal the area. Change its food and see the results. Also carefully observe if there are fleas in your dog. Flea allergy also causes such bumps on dogs. If home treatments do not work then take it to vet before it turns into tumor.

 Hey my dog is much much better :) thanks for all of your great answers! He was really really swollen for about 3 days and after paying special attention to my baby boy, his swelling started going down! We are guessing he got stung by something, and there is a possibility he put his nose into an ant bed! But I really appreciate your help! We gave him soft food and warm milk; he also stayed in my bed, which has a mattress warmer on it! Thanks-Emmaleigh