It's a tough thing to do, and thank god I've never had to do it. However, I do have a dog and she's my best friend. I know that when that time comes, I'll "just know". It seems by your post that you "just know" and are posting here for some sort of confirmation. I can't tell you to put your cat down, or to not do it and keep giving her the pills. All i'm sayin is that we'll all be here when you need to vent after its all over. Good luck to you...