Hi,,I Suffer From GERD,,like Big Time,,my Esophageal Vale Is Like

Hi,,I suffer from GERD,,like big time,,my esophageal vale is like I don't have one,,I need to do the Fontaine surgery,but have to lose weight,,my question I just ate can I take my omeprazole now?,,will t be effective,,if I don't take anything,,I've got hell to pay in the night,,