The elevated bed, big pillow thing didn't work well for me. I take Prilosec ,for acid reflux.
I don't know your weight etc but that is a big instigator many times. It is mine. When I lost all this weight before, it went away as did some other problems. Crowding the diaphram, with a fuller stomach and going to bed that way can cause coughing, and burping up stomach acid etc.
I'm fighting real hard to lose the weight now. Warm weather comes along and I will shed some of it anyway.