What Causes Persistent Pain In Lower Left Abdomen?

sir , my brother was feeling pain on left side lower of stomach since 3 month. But one month back one docter started curing him by antibiotic medicine. but nothing happened. after 10 days later he tried muscle contraction dosage. Eventually , Pain started with more intensity and on right side new pain at same time on right side of lower stomach. Other hod gastro, got the full colonoscopy . Surprisingly , reports shows that he has lymphoid hyperplasia non specific chronic in his terminal ileum. he has advised for mesacol od 1.2 g x 3 times a day. Is it right to take mesacol ? . I am very much confused why is pain on left side . Now he is feeling pain on both side and no relief . He has taking medicine for last 10 days. From Brijesh