I had the same problem. I tried adding align probiotic and it helped some but I still had lots of gas. When I started a new diet that took me off all soy, it all stopped completely. I became sugar free, sugar substitute free, wheat free and especially soy free. It was a little hard to find things to eat as you can imagine, but all the gas stopped and I have really begun to lose weight after trying for so long without success even though I was eating l200 calories and exercising. I have not even exercised that much and I have lost 8 lbs in 2 weeks. I always heard that those protein bars with soy could make you fat....now I believe it.
Welcome to the gastroenterology community! First, I would recommend making some more dietary changes. This would include eliminating lactose, beans, and carbonation from your diet. If that doesn't help, I would recommend seeing your doctor to discuss possible problems this could be.