Congestion and blocked nose. Suggest.

I was dealing with sore throat and post nasal drip from one month, I had a feeling that something's stuck down my throat and chest, I took Augmentin 625 and Pantop D but it didn't get any better. I felt chest pains also where I felt congestion. Then post nasal drip started. Coughing is very minor and not at all some days but mucus secretion and congestion is there. It's clear watery liquid that was running through my nose and coming out of my mouth as well. From last week I started feeling nasal congestion, swelling of inner walls and difficulty in breathing due to it, it gets worse when I lie down. Plus I've realised the central wall of my nose is slightly more towards left nostril but it has been like that for all these years may be. I have been taking Rabekind, Zifi 200 mg, Mont Air LC, Vitamin C tablets, Asthakind Syrup, Steam Inhalation thrice a day and gargles thrice a day. Problem has reduced a bit but nasal congestion is there and it's troubling a lot. Please suggest.