Gerd pillow/wedge
I tried wedge pillow a while ago when I had severe heartburn. Did it help me? Yes, a bit. But in case of severe heartburn it won’t make that much difference.
Biggest problem with it is that you can’t sleep very well. Your blood goes to your legs and your sleep quality significantly decreases. So try it but don’t think about it as a long term solution. PPIs usually provide much better relief. And if you combine it with other remedies described on this site you can get rid of it once and for all!