Suggest Remedy For Nasal Congestion

Hello. I've had a cold for 5 days now. It started with severe nasal congestion and a headache. The headache disappeared after 2 days, but I still have quite a bit congestion. I have been rinsing out my nasal passages with warm water & kosher salt several times a day. Today I noticed an ammonia smell in my sinuses. Should I be concerned? Should I see a doctor? Thanks for your attention.