Hi, my 2 1/2 year old neutered male cat has had some sort of urinary problems for the past year. He visits the litter box very frequently and stays in the box for several minutes. He does eliminate urine each time. It appears to have some blood in it. After several hundred dollars in vet bills, we still don't have a clue. His urine sample did not have any bacteria or crystals. He went through a month of aniboitics with little improvement. He was on his death bed when an acqaitence suggested giving him vitamin C, cranberry capsules, corn silk capsules and subque fluids. His condition improved greatly. The problem seems to be chronic at this point. I love him so much, I even consider him my middle child. Any suggestions?