So, last night he seemed really bad. Almost no energy at all, and if you picked him up, he'd just hang limply from your grasp. His eyes looked really bad too. So, we made the decision to take him to a 24-hr emergency vet.
Since I HAD to get some sleep (between the snow and training, I've only been in the office for two full days out of the last two weeks, so I'm seriously back-logged), Jessica took him at midnight.
Sure enough, he was blocked up. His bladder was hard as a rock, and potassium readings on his kidneys were off the scale. Cost to "clean him up" = $3000-$4500. Jessica called me to "clear" it, and I told her to do whatever she had to do. I couldn't just sentence him to death.
After I hung up, I started to get really pissed off - probably a product of me being woken out of a sound sleep. I thought about how this basically kills our plans to see U2 this year, and how we're spending all this money on a cat who basically shows us zero affection and makes every effort too be on the opposite side of the house from us at all times. I know that probably sounds horrible to cat people, but your mind thinks funny things when you get woken out of a dead sleep.
When Jess got home, she had better news. The vet found a scab on his penis that was causing the problems, so the bill is going to be a lot lower. They're keeping him overnight to make sure he's ok, then we'll get to pick him up. So maybe the U2 plans aren't in jeopardy after all.
I want to say thanks to Sicy and everyone on the forum who provided input. Without it, we would never have know how serious his condition was, and he could have been dead this morning. I'm looking forward to having him back the way he was, even if it does mean we only get fleeting glimpses of him as he dashes around the house to get away from us.