This sounds crazy but the exercise I've been doing to try and get my breech baby to flip relieves so much gas its like it releases all the trapped gas in your body. Its called the forward leaning inversion you'd have yo youtube it to see how its done
Do a pressure massage on your belly, theres one where you go in circles (you can look up on YouTube) or just rub your belly, thats what my boyfriend does for me when I have gas really bad