Congested

I’ve been so congested for as long as I can remember. It’s always one of two things. Stuffed up nose/w drainage or mucus stuck in the back of my nose passage to my throat. I can feel it every time I swallow but it feels like I can’t swallow enough to get it out. If I try to blow my nose it’s like nothing is in there. And then if I try to clear my throat it slightly moves enough for me to feel it but I can’t get it to come out!! Please help!