Awww Vicky I know exactly where you are coming from, see my post entitled Jess is at the vets,
Jess has blocked twice in the past 3 weeks, his is stress related though there were no crystals or anything unusal in this urine or bloods.
Its awful, Jess has come round to eating the renal food, he wouldn't at first at the vets but he is now, I brought a water fountain to try and get him to drink more and its working,
Its such a great feeling when they do a big wee isn't it,