Hey Teresa
My thorough experience with gas...ugh. I find that when it has finally moved to the decending/traverse colon and for whatever reason just won't come out that the yoga position downward dog just lets it rip! Oh man I've literally had gas come out for several seconds in that position. Gross maybe but the relief! I don't know about pain trying to figure that one out myself but that has been a huge help for me when the gas builds up and get far enough along.
Good luck!
April