Suggest Weight Loss Plan When Treating GERD, Increased Pressure In Rectal Area

i started a weight lose program slim for life about 3 weeks ago. My diet now includes an additional 50 grams of protein from supplements drinks and bars. The plan is 1100 - 1300 calories a day. I'm diabetic controlled by diet i also have GERD . Since i started the program I have developed gas and increase pressure in my rectal area. Could this be caused by an increase in protein in my diet from supplements?
Did not have this problem before i started the diet. I'm 74 years old