I have the same problem. (age 32) I've always had a flat stomach and since the beginning of the year I've been bloated to the point I bought pregnancy tests because I too thought I might be pregnant despite the fact I'm on the pill and still cycling.
I did research and decided to add pro-biotics to my diet. You can go to sprouts and in the dairy section there are "attune" chocolate bars or granola bars...they are kind of pricey, BUT much cheaper than ordering online. About 6 days in my digestive system started to rebalance itself and the gas/bloating has subsided.
Now every morning I have a chocolate bar or granola bar for breakfast and I'm set. Even my kids eat them. 5x the amount of probiotics than I think 12 things of yogurt...I was a skeptic, but now a believer. Flatter stomach, more regulated digestive system, and my hunger has been curbed as well.
You can call Sprouts and ask to speak to the dairy manager and they can specifically order the flavor of your choice. If you buy the whole case (7 small bars) you get a 10% discount. So for $10 or less, you get an entire weeks worth of digestive health.
For additional research: http://www.attunefoods.com/