Hi welcome to the health care magic Here you are having erosive gastritis as per history by endoscopy findings.... For that you had been prescribed lansoprazole and than replaced by famotidine.. Famotidine is also effective in reducing acid secretion but it is not as effective as proton pump inhibitor If cost is issue than omeprazole like another drug from the same group can be prescribed... Complete the course of antacid drug for two to four week according to prescribed duration Avoid excess spicy foods and smoking.. Cooked oatmeal help in soothing stomach Take care Consult physician for examination with keeping all this in mind Hope your concern solved