My son, who is four years old and should know better, stuck a foam sticker waaaaaay up his nose.
I have done a doctor trip (same son, peanut) and an ER trip (oldest daughter, pea) for the same thing before. I really didn't want to do it again.
But last time we had a something-up-the-nose incident, our twins were in the NICU. And when I went to visit them, I told their nurses about it. And one of them shared a trick with me, one she'd learned from a paramedic. Here it is: plug the unclogged nostril with your finger, and then cover your child's mouth with yours and blow short and swift into his mouth. The aim is to blow the obstruction out of the uncovered nostril.
So I just tried it. And guess what? That sticker flew right out! That slimy, slimy sticker.
I'm so chuffed that trick actually works!
(I have to say though: this is not medical advice, and I'm not a doctor. I'm sharing an anecdote.)
It worked, it worked and we're not going to the ER today! (I hope.)
peace of Christ to you,