Post sleeve gastrectomy GERD is a known issue. Initial conservative treatment is the way to go ahead. However since you have taken almost 2 years of PPI and no resolution it's no no longer the preferred modality of management.
Your doctor has advised you rightly to consider a Roux-en-y- gastric bypass.
Next Steps
Revisit your surgeon, understand the pros and cons of the Bypass procedure and make a conscious decision