Tums is horrible try liquid antacid it's what they gave me in the hospital it works quick I try just a small portion of the recommended dose and just keep upping the dose untill I feel comfortable
Apple cider vinegar. I get it pretty badly, too, so I just do a shot of Bragg's apple cider vinegar, and I'm good for a bit. All natural, no medicine, no chemicals, no risk. Mahe sure you hit up the water afterwards for your throat and teeth.
My doctor put me on Prilosec once a day till the end of my pregnancy & it's been amazing!
I have a list of safe medicine in my journal, there's a section for heartburn you can look at:)