Zantac and pepcid ac helped me
I bought the store brand Zantac. Only thing that helped me. After Tums, it's the next thing the pharmacist recommend (they have a chart).
Prilosec is amazing...you have to take it daily though and it takes a few days to really start working real good
I do tums and added a second pillow at night so my head is slightly raised
Eating pickles and drinking pickle juice. Or just straight apple cider vinegar. Takes it away instantly.
Zantac is only thing that's worked for me since tums stopped working
You could try a heartburn tea before you go to bed. It helps some. Also yoga.
I do think you should talk to your OB and see what they can gave you.