Relentless heartburn

Hey friends - I’m 12 weeks and the heartburn will not give up! It’s keeping me up at night and sometimes even waking me up (like tonight) and causing discomfort no matter what I eat (even a bowl of bland cereal). I’m trying to eat bland and small meals, falling asleep sitting up, etc.

What’s worked for you!? Tums isn’t cutting it. I’m tempted to try Zantac but have also been told to try apple cider vinegar or baking soda in my water. Any thoughts? I have my 13 week appt on Monday so I’ll check with my dr then too.