Could be all the things you've mentioned, or could be stomach acid. When my stomach acid is acting up, I get gassy/burpy when I eat or drink. Are you on an acid reducer , a PPI?
Height 5' 7" High Wt 268 / Consult Wt 246 / Surgery Wt 241 / Goal Wt 150 / Happy place 135-137 / Current Wt 143
Tracker starts at consult weight
In maintenance since December 2011.