Our 4 year old son gets a stuffy nose a couple times a day. If he gets upset and cries it will get stuffy, and oftentimes as he goes to bed it will get stuffy from the transition to laying down. If he calms down/lies still for 5 minutes it will clear up.
Unfortunately, he's gotten into a habit of, when he gets even a tiny bit stuffy, he'll start scrunching his face and sniffing hard, which rapidly makes it so much worse. He'll then get upset about it, and it's a self-reinforcing cycle. Soon he can focus on nothing except that he's stuffy and can't breathe, and throws a fit about it.
We've tried explaining that just breathing calmly and waiting is the best thing to do, but he gets mad about it. Any suggestions for just dealing with it while waiting for it to clear?