Consult a GI doctor, I had to have an endoscopy before RYGB surgery, and my GI doctor followed up with me about my esophagus health. He had found Barrett's esophagus and prescribed a different acid reflux med then my surgeon had me on. My surgeon had me on acid reducers anyway, but my GI doctor had to switch me to a stronger one based on his diagnosis. Tums can make the situation worse if it is digestion induced. When I have had episodes of nausea following surgery for various reasons (eating too fast, wrong foods, eating too much, not stopping when full, etc). If nauseated or after vomitting, I had not been able to keep anything down for almost 2 hours, meds or not! Just relaxing and breathing until the episode passes is the best meds. When I feel everything is relaxed I try 2 oz of clear liquid for about an hour, basically working through the phases of my nutrition plan slowly ea hour. Some OTC antacid treatments are NSAIDs so be careful with that as well and ask the pharmacist.