Along with dietary remedies, don't forget non-food acid reflux remedies. I had terrible heartburn when I was pregnant and it really helped me to sleep at an angle, with my head higher than my feet. I also had to be void eating for a few hours before going to bed (which is hard when you're pregnant and always hungry, but probably less so if you're not!).
Chewing sugarfree gum after a meal also helped me; apparently it generates saliva and that's supposed to help. (For me, it was particularly beneficial because it replaced a peppermint Altoid - they have real peppermint in them and so encourage heartburn.)
I also read that you shouldn't drink too much water with a meal but should drink it between meals instead. That one, I found it hard to tell if it was helping or not.