Are you talking about blockage of the males urinary track? I know that my cat Charlie Murphy got it twice in about a month. First time I noticed he was acting weird and could not pee and was looking like he was trying to everywhere. After being confused for a few hours I realized something was wrong, check online and everything said go to the vet immediately. It was late at night at this point so I had to go to the ER vet (ie....$$$$).
So I went and they drugged him up and were able to insert a catheter and were able to get through the blockage. They gave me some drugs to apparently help and sent me home some $500 later.
About 5 days later, I noticed it was happening again. So I took him to my normal vet. He basically gave home some sort of injection and they watched him for three nights and I think they guy charged me like $50 because he knew I was a college student.
Pets in college = bad news at times. Charlie has cost me a ton in vet bills.
This was the other fun thing he showed up with I posted above....
http://i15.photobucket.com/albums/a3...0615061952.jpg
Again, went to the ER vet who wanted like $1000 to fix it. So after leaving (and still having to pay like $300) I went to the normal vet who literally just help charlie down and stapled the wound like it was nothing for under $100 with some meds.
Not totally sure if you cat was having the same problem as mine, but the fix was easy. I feed them Hill Prescription C/D (both cats...and not much else but maybe a can of tuna a month) and I have had no problems since.
Hope you cat gets better. I know I was stressed when I was going through that.
Few more pics
http://i15.photobucket.com/albums/a3...y/IMG_3511.jpg
Camera phone pic of dante in attack mode
http://i15.photobucket.com/albums/a3...urphy/aaaa.jpg
http://photos-f.ak.facebook.com/phot...425365_928.jpg
again, crappy camera phone pic
http://photos-h.ak.facebook.com/phot...37087_4169.jpg
http://i15.photobucket.com/albums/a3.../Dunton001.jpg
http://i15.photobucket.com/albums/a3.../Dunton002.jpg
http://i15.photobucket.com/albums/a3.../Dunton131.jpg
Dante trying to hide from a bath
http://i15.photobucket.com/albums/a3.../Dunton142.jpg
http://i15.photobucket.com/albums/a3.../Dunton147.jpg