Sleep only on your LEFT SIDE, stomach acid cannot come up into your esophagus (use a pillow or body pillow to keep you in that position only during the night). Elevating the torso is good too, not just the head.
Don't eat any high fat food, nothing fried, alcohol, caffeine etc. Keep a food diary, if something bothers you just don't eat it.
Take DGL licorice - you can get it in health food stores or vitamin shops (see all my postings on this board, there are many - under DANIE). Dissolve 1-3 tablets (see which amount works for you) 20 minutes before eating anything. Do the same at night just don't drink anything afterwards. The licorice (does not cause high blood pressure like regular licorice) coats the esophagus and therefore helps it heal.
I know people that have gone off their GERD drugs (some on them for 10+ yrs) and just control their symptoms with the DGL. Of course, I had to hound them to do so. I tried on this board to keep posting everything positive that happened to me but people just don't get it. If someone has multiple problems (other than just GERD) it's extremely difficult to cure.
My GERD was just caused by using ADVIL, and mostly at night, to help ease pain from a fall. I was able to cure it in 1 month.