Suggest Treatment For Severe Pain In The Back And Waistline

First my symptoms. I have pain in my back, just below the waistline, Right side only, intense dull aching, 8/10 for last 5 days. It has not been relieved by OTC pain med-aspirin and ibuprophen. I have only slept about 4 hours total in these 5 days and I am exhausted. I ve been thinking I m constipated but increasing fiber and liquid intake has not helped. My urine flow has been reduced and I have only had 3 small bowel movements. This has begun to scare me as I can get no relief from walking, sitting, laying heat or cold. I can tell you it is not sciatica as it is not sharp pain going to my foot. I ll be going to my doctor later this week but I need relief. Any suggestions?