Poor little man. I hate it when the tiny ones are sick - you just can't tell what they need or what hurts. When my babies have had stuffed noses and had a hard time drinking, I found a few drops of saline (you can buy it, or make your own with 1 c warm water and 1/2 tsp salt) in the nose helped clear things out enough for them to nurse.

Hope he's feeling back to normal soon!