Post nasal drip and congestion. Of now.

For past one month I'm having post nasal drip and urge to clear throat even though nothing comes out except for a little transparent watery liquid. Same with my nose, it's ticklish, sometimes I sneeze and this watery liquid is there. No yellow or green mucus present, light green mucus comes out of chest only after I cough really hard that too in a very small quantity. I feel chest congestion or something's stuck down my throat and chest and it pains. I've developed extreme acid reflux as well. Things get worse at night, I've started having a blocked nose even though there's no mucus in my nose just that transparent watery liquid. What it could be and how do I treat it. I've taken Augmentin 625, pantop D and steam inhalation. Please help and provide some solution, it's been a month and because of lockdown I can't go to hospitals and get any tests done as of now.