Don't wait, have your kidneys checked out ASAP!! I really hope you take this into consideration and rule out any kidney trouble.
First scope 7/05 should no UC, but I was bleeding with urgency. Sigmoid showed UC at rectum, 2nd colonoscopy & Endoscopy 7/27/07, Left sided colitis and near cecum (mild)
8/1/08 on sulfasalazine 2 2x's a day, canasa often.