Hello, I'm a 24 year old female and went to the emergency room the other night with severe back pain under my ribs and was starting to hurt in the front abdomen. They said I had blood in my urine but had diagnosed with thoracic spine strain. They prescribed me cyclobenzaprine and tramadol. Still in alot of pain, its been 2 days and its now hard to pee and a few drops of brown stuff was in the toilet and when I wiped there was brown on the tissue, almost like blood, just brown. Im wondering if I should go back to the e.r but what could it possibly be?