Chronic bloating after Rofaximin

Hello- i have had chronic bloat for the past 2 months. i did a 1 week course of rifaximin 2 yrs ago and had success, so i repeated it for 5 days and after i did not experience the same results and ever since i have had on and off bloating. i can be perfectly fine one day, then the next day after a BM i will bloat up and have a distended stomach and then be fine again the next day. Any idea what this could be?