Flank pain right side.

[Ec1ruam]

Hi , in desperate need to discover the cause of excruciating right flank pain which came, without injury, 6 weeks ago. Comes daily say, each afternoon, even when on prescribed rest. Pain lasts 6 to 8 hours and I get no relief even from opiate analgesia. No problem first thing following morning except a slight discomfort. I am a 70 year old male in otherwise good health but do have an ostomy stoma on my front right. Thank you for reading.