Left 1yo male longhair orange tabby at home over weekend 2 nights out of town with ample food and water. Cat used my laundry as a litterbox Wednesday. I change litterboxes as soiled, multiple times/day. Last night (Saturday) 2am my cat was using the litterbox every 5-10 min and jumped in sink, small dime size volume hematuria. Collected urine sample. Cat continued straining to urinate, vocal, listless. Abdomen slightly guarded, bladder did not feel distended upon palpation. Cat knocked over laundry hamper and climbed in it to hide. Evaluated urethral orifice and observed slight edema and constricted state of orifice. Gave 1/8c ground up dry food (Evolution grain free chicken) mixed with 1c filtered water every 2 hrs (4 times total). Cat remains overzealous about food and raced to his spot. Cat drank all watered down food offered. 9am looked in litterbox. Cat frequently urinated a large amount (4"diameter pool) every 15-20 min. Observed that cat's backside remained wet with urine, examined urethral orifice and found that the orifice was no longer edematous or constricted but open. Cat no longer straining to urinate. Urine passed upon squatting. Continued to give fresh watered down food. Cat continued to drink the watered down food for the past 6 hours and when offered again at hour 8, he didn't drink it. He drank out of water glass. Cat is chasing/playing with toys by himself and climbing on high surfaces, batting items off countertop. After 4 hours, Cat groomed himself normally and settled down. Cat is now curled up sleeping on the couch next to me, calm temperament, normal respiratory and heart rate. Has not visited litterbox in 3 hours. I am only concerned that he has not defecated in 24 hours. Should I still take him to the vet appointment in the morning or will wet diet, cranberry extract and cosequin suffice to prevent further episodes? Ddx?