Physician, Diet and Exercise
I have acid reflux too and it's pretty much in the same way you describe. I take Nexium and I'm fine unless I stop taking it. When I do, within a day it's like a swallowed battery acid. So I make sure that I never run out.
However, that being said, I see no correlation with acid reflux and putting on weight. Why is it that you make that connection? Perhaps you should talk with your physician about this. Perhaps there's a different cause than you think.
Here's another theory...perhaps what you have done with the weight is you put on muscle or mostly muscle?
I spent my entire adult life at the proper weight within 5 lbs. However
I put on 15-20 lbs from the age of 50 to my present plumpness at 57. I feel that some of this gain could be attributed to the normal part of the aging process, and the rest to my not getting enough exercise.
I'd recommend seeing a good physician. Also consider looking at your diet AGAIN and making a log/diary of what your eating, too. Somewhere you may be eating the wrong foods..or you're eating more than you think.
Thyen again, I could be full of it, too!