I Have Had Cough For Almost 6 Months It Used

I have had cough for almost 6 months it used to be hard and loud antibiotic cought medicine Dayquail did't help also was then given inhaler 40 and 80 mcg didn't improve. Specially at night when laying down on bed it causes terrible cough no mucus only white spit after 1 to 10 mintues I finally stop and go to sleep but still hear like some mucus is blocking my breathing and hear all fancy sounds while I breath, try to clear throat but sounds don't stop. Feel like I want to scape y throat clean. By coughing so hard my throat hurts. After CT scan Lung examination and ENT visit I am given RANITIDINE 150 MG TOOK 1 last night . I may start taking 2 now but now sure if this is the correct answer to my problem. I don't cough all the time sut a few times during the day and at night when I go to sleep and when I wake up in the morning. Is this serious should I continue RANITIDINE? Dr told me to try for 2 weeks. Please advise.
I read a lot of side effects for inhaler so I stopped. I still keep it handy if I feel short breath I take 2 puffs and it helps but wonder if this is temporaty help!