You have one stuffed up nostril or both and it's not from boogers or a cold? You just have random stuffed up nose? It's really annoying.
Yeah. That's your sinuses enlarged, happens to me a lot.
Yes, that happened to me a lot. When I had my tonsils out, I somehow mentioned that annoyance to the eye/ears/nose/throat doctor as well, so he cut out some of the (internal) enlarged soft tissue (turbinates: An enlarged turbinate can cause of nasal obstruction.). It worked; after everything healed, I was able to actually breathe out of my nose. I couldn't remember ever really being able to do that before.