Kitty Troubles

Felix the cat is ill again.  He's had to spend the last two nights at the vet.  I'm really worried about him-- and about my financial ability to care for him.  If he makes it through this he'll have tons of medicine that I have to pay for, and he has to go on a special diet pretty much for forever, which will get expensive.  Then if he has a re-blockage... that won't be cheap.  And if he needs surgery for this, I'm not sure I can afford it-- especially after last month's Emergency Vet bill.  But he's the sweetest most wonderful cat in all the world and I don't even want to think about horrid possibilities.  The vet should call later this morning to let me know how he fared through the night, and I'm a little nervous about it all.  Has anyone else had kitty troubles?  What did you do about them?