I know where you're coming from as a fellow fibro, gerd, scoliosis, and disks sufferer, + post-polio. I had surgery for a paraesophageal hernia last fall and have had trouble with gas since then.
Keep off gassy foods for a while - broccoli, beans, cheese, milk, anything with sugar, bread, eggs, most starches.
Non-gassy foods: rice, summer squashes, carrots, greens rew and cooked.
As a GERD patient you may also have food intolerances, aka allergies, which "trigger" reflux. If so you'll want to keep a food journal and identify the culprits. Be specific. It's not just a hamburger, it's a bun, meat, mustard, ketchup, pickle. I've posted often in the reflux/gerd forum how to do the food challenge test.
I can eat the meat just fine. It's the rest of the burger that contains the sulfite that is my trigger. Lots of meds have it too, so I keep lists in my purse and was glad to have them along when I got hit by a girl running a red light last year.