I know many with DS/VSG who went off PPIs without incident. In fact, Mexicali Bariatric Center (Dr Esquerra) recommends stopping after 3-4 months (I can't remember) as do many other American DS surgeons.
And then there are others like me.
I started PPI 2 months before DS for "silent" GERD. And it remained silent... until I tried to get off PPIs about 6 months post-op. Before DS, I was told I'd have to be on it forever unless [doctor stares at me up and down] I made SIGNIFICANT lifestyle changes. So I got DS and lost 110+, slept on bed wedge, avoided acidic foods, gave up coffee and tea, etc. I did wean myself down to 20mg vs 40mg. But when I tried to get completely off... AGONY. So I returned to 20mg only now even THAT didn't work so I was taking 20mg PPI in the morning plus 75mg rantadine at dinnertime. (One step BACK!) Months passed and after researching protocols for how to slowly wean oneself off, I tried again. I got off PPI (briefly) and was taking two 75mg rantadine 12 hours apart. I was miserable but tried my damnedest to stick it out until the reawakened acid producing cells stopped acting berserk and settled down. I added fistfuls of Tums (calcium carbonate) to help ease the pain and in 6 weeks developed the most gigantic kidney stone. (Turns out calcium supplements were the cause of my kidney stones post DS, but that's another story.) I gave up and went back to 40mg PPI until the gastroenterologist completes his tests in two weeks. (I suspect I just have a "lazy" esophageal sphincter due to age.)
Be aware that H2s have the same dangers such as dementia, higher infection rates, especially c-diff, as acid fights infections, and kidney stone production as calcium metabolism is impaired. PPIs have all of those dangers and also add possibility of swift and permanent kidney failure. Your body needs acid to work effectively. The only reason to go to H2s (if they work for you) is that they are supposedly easier to get off of than PPIs.
Google PPI withdrawal and you will find the methods for getting off the drug. It should be a s-l-o-w process -- maybe as long as months.
Good luck