I'm having some trouble with my breathing that's been going on for about a year now. Around this time last year, I started noticing a bit of a problem with my breath, like my nose isn't always open properly. Sometimes I have to breathe through my mouth, and it feels like there's some sort of blockage in my nose. It got better after a few weeks, but now I'm experiencing the same issues again. It gets harder to breathe whenever I try to sleep, and I've even started feeling some chest pain. What could be causing this?