My daily routine includes 20 mg famotidine in the morning and evening. It seems to be working Ok. I have to avoid lactose, excessive fat and excessive spice. When I fail to do that, I pay an uncomfortable price. The less efficient digestive process demands 2,000 calories or I lose weight. Prior to the surgery, I maintained a steady weight with 1250 calories 5 days per week and 600 calories 2 days per week.
I hope you are getting enough protein. There are supplements such as PreProtein which provide 15 grams of protein in a one ounce dose. Fairlife protein shakes are also lactose-free, and the chocolate variety is delicious.
Good luck to you.