Stomach pain after passing stool in even

Dear Doctor, Please advise some medicines b'coz there is a pain in evening in my Right side of stomach after passing stool. When i did sonography it's mentioned balloning of right side kidney.. 19yrs rs b4 there was a puj obstruction on right side due to which i have been operated. When i met urologist last month after doing tests,doctor said it might be due to gastric problem which puts pressure on right kidney. Please suggest some medicines which i can take to reduce my stomach pain on right side for temporary basis, as this pain i do get 2-3 times in a month and its very difficult to control. Please help as i am planning to meet a good urologist after few months as i m not in a condition to afford treatment at this stage due to my parents health issues and surgery. Requesting God (Doctor) to help me with some pain/de-swelling medicines for.my stomach