The heartburn is real!!!!!

It has struck me down! I'm 29 weeks and just getting it (thankful it waited that long). It doesn't bother me much if at all during the day, but as soon as I lay down to go to sleep it's like someone poured battery acid down my throat. I've actually thrown up on myself in my sleep from it. I can't sleep propped up. It's not an option. I try laying on my left side I heard that helps. It makes it a little better but not much. Tums don't do a thing for me. Anyone have remidies?