Does Walking And Sitting In The Right Posture Help In Managing Indigestion?

Hello my name is zainab and from pakistan muslim. From last three months i feel pain and difficulty in digestion after eating. I checked two doctors and they diagnosed gastritis. One of the doctor gave me esomeprazne, librax and papsid c enzyme for one and half month. After that i get better. But now i also feel that pain again and difficulty in digestion for one week. I am a Banker so i have to sit continuously and can't walk enough. I also feel my sitting posture causes this problem to me. Does walk and better sitting posture help me to treat this condition because i don't want to take more medicine. My ultrasound,ecr, and x rays were all normal. Kindlt guide me