Dealing with a Chronic Cough: Seeking Advice

I have been experiencing a sort of light cough for months now, my doctor has said it is either gastroesophageal reflux disease or post nasal drip. I do have a deviated septum and constantly annoyed stomach (pretty easily nauseous or even just a ton of acid reflux). I do want to try acid reducers for a while (not sure how long, but i know that when I have taken them it helps a ton!!) and the problem with having a deviated septum to cause post nasal drip is that nettie pots wont work usually, and on the deviated side saline spray doesn’t do much. I don’t necessarily want to go see an ENT or even a gastroenterologist because they might try to stick things up my nose or elsewhere which isn’t preferable. But should I? it’s getting to the point where when I get a cold or allergies the drip will last for weeks after, and then I get bad coughing fits from a tickle at the side of my throat. It isn’t really messing with my daily life when I don’t have a cold. I had one like a week or two ago and it settled in my sinuses and SUCKED, but I really am still not sure what I should get checked out or leave alone with all of my problems lately…much appreciated!!