Natural nasal congestion remedies:

• A lot of Vit C (look up "liposomal vit C")
• Pantethine (preferrably sublingual)
• Some exercise (produces natural epinephrine)
• For some quick relief, nasal irrigation with saline buffered solution and just a tiny bit of sodium ascorbate dissolved in it
• Inhaling steam from hot water or teas (chamomile if you're not allergic to it) is also good. Preferably use distilled or pure spring water
• Never take nasal decongestant sprays for more that three days