Hey Jdlawn!
Welcome to our board! One of our other members, NorthernJoe, suggested that drinking Spring Water only can help alleviate GERD symptoms. I myself have not tried this yet, but if it sounds up your alley, give it a shot!
I know that you shouldn't take too many antacids, period. I've never heard about them causing cancer. If you're experiencing gas, have you tried Phazyme or Gas-X? They may help with your pain.
Hope you're feeling better soon! :)
Toni