Nose block breathing problems. Problem!

Hi My name is beeru chauhan My left nose is blocked all the time it been more than 10 years I am facing this problem. 1) first I left drinking dairy products it got reduced to some point. 2)I have realised that whenever loud noise goes to my right ear my left nose is getting blocked and pain in my right nose getting worsen. 3)Its feels like there is no blood flow in my left nose side and which is cousing to create mucus to block my nose.becouse while sleeping in night my left nose is blocked show I have to wait to open my nose to sleep. 4)I am putting my right ear on bed for 30 minutes which is cousing to flow blood in my nose after doing this my nose is getting opened then am able to sleep. But again daily my left nose getting blocked I am not able to think anything clearly I am getting always confused. Please doctor do any suggestions or solution to cure this problem Thanks you...