Rebound is real, though not everyone experiences it. There was a study where people without GERD took PPIS, and when they discontinued the PPI some had rebound for up to 8 weeks. You need to cut back gradually, go from a PPI to an H2 blocker before discontinuing completely. I did this and still had pretty bad heartburn for about 2 weeks after tapering off the PPI, then another week but not as bad when I stopped taking Zantec. I am off meds and follow the Fast Tract Diet for Heartburn. There is a thread here with more details about this diet.