While Im not a doctor, my mom had this exact problem for 2 years. No doc could figure out what was wrong and she would blow up so bad she looked 9 months pregnant. They finally tested her for h. pylori and found that she did in fact have it with a combination of IBS. She was given meds for h. pylori and it went away. The bloating is now under control as long as she avoids dairy and certain foods.
Another note I went to the GI tract doctor I have no cieliac disease nothin everything looks normal besides gas I'm even taking charcoal capsules