heal this cough I've had for a year

I’ve seen several doctors, had many treatments and medicines. Nothing so far has worked. It could be allergies, they say. It could be acid reflux. I have all the symptoms of acid reflux: heartburn, clearing my throat habitually, dry hacky cough. I’ve tried accupuncture, allergy meds, nasal sprays, Prilosec, now I’m trying Nexium. I’ve had x-rays that show nothing. Cat Scan nothing. It’s very aggravating and depressing. I’m hoping the Nexium will work, but it’s slow going.