Here's the problem as I see it: you may not need an antacid at all and if you've tried them all with no relief then it's very likely that you have
low stomach acid. Do you have problems digesting red meat? Get all gassy after eating? Get heartburn or acid reflux? I actually rarely get heartburn unless I've been overindulging over the holidays but the red meat can tear me up at times and be fine at others. Gassy at times? Mmm hmm.
I think that's why vinegar works better for some and baking soda better for others and the symptoms for both are similar, but if you had plenty of acid then you'd be able to digest red meat.
There is a rather crude test you can do with baking soda--mix 1/4 teaspoon into a glass of water and drink it up and you should belch within 5 minutes. If not, then low acid is likely your problem. You can google up betaine HCl and hypochloria if you want to know more about it. I've been avoiding meat at those bad times but I read that it's actually better to fix it with the HCl as low stomach acid can cause malabsorption problems and let more pathogenic bacteria in, as someone suggested earlier.