my doctor explained to me that as we gain weight in the midsection (ahem postmenopausal), there is LESS ROOM
and the stomach is "pushed" smooshed" against our bodyfat....one of the most common causes of acid reflux...less room to move what we ingest freely.
I use the fiber choice chewy pills, I also have the miralax fiber stuff, recommended by the doc, it's so flipping expensive OTC, but I get freebies from the hospital.
glad you feel better physically, it has to make things a little easier to deal with.