According to the symptoms you report (diarrhea, gases, bloating and discomfort on right side) you could be experiencing an intestinal inflammation. The nature of the inflammation (infection or something else) can be determined with a microbiological examination of the stool and a colposcopy. An abdominal ultrasound scan and standard blood analyses (blood count, sedimentation, liver and renal status) are also requested. You should also request an HIV/AIDS-test. You may consult a gastroenterologist to follow up.