Cold? Sinuses? Allergies?

How do you know the difference? It started Thursday night with a runny nose and before the night was over I was completely stuffed. I attempted work Friday night and I was in the bathroom blowing nothing out of my nose more than I worked. I bought breathe right strips and headed home. I went to bed after soaking in a vapor bath for almost 2 hours and wearing a breathe right strip. Saturday my throat was sore, but it didn't last. Now almost 4 days later I am still stuffed up and cant blow anything out.

UPDATE:

last night was horrible! I couldn't breathe at all! I was up at 3am sitting on the couch drinking a cup of hot tea.