Bad heartburn

I'm 37 + 3 and for the past month or so my heart burn has been terrible. It's gotten so bad that I wake up from dead sleep coughing and gagging like I need to puke but nothing ever comes out. I've tried sleeping propped up and taking heartburn meds but nothing helps. And it's not every time I sleep it's here and there and I'm so scared of throwing up in my sleep because of it. I can smell the throw up in my nose when I sit up and try to breathe normal. I've mentioned it to my OB all she said was to take tums and don't eat before sleeping. But I take a bunch of mini naps throughout the day and night instead of sleeping all night. Is anyone else dealing with this? Will it go away after my baby is born?😭🤢🙃