you really did do the right thing i had a simular situation with a hamster he blew up like a bloon and the vets didnt know what it was and i thought to myself 'what if he gets ill at the weekend or evaing when i cant get him to the vets' at least you kitty wasnt in pain you did him a favour this poem is about a dog really but it could be used for a cat too

If it should be that I grow frail and weak
And pain should keep me from my sleep
Then you must do what must be done
For this last battle can`t be won.

You will be sad, I understand,
Don`t let your grief then stay your hand
For this day, more than all the rest
Your love and friendship stands the test.

We`ve had so many happy years
What is to come can hold no fears.
Would you want me to suffer? So
When the time comes, please let me go.

Take me where my needs they`ll tend
Only stay with me until the end
And hold me firm and speak to me
Until my eyes no longer see.

I know in time that you will see
It is a kindness that you do to me
Although my tail it`s last has waved
From pain and suffering I have been saved

Do not grieve it should be you
Who must decide this thing to do.
We`ve been so close, we two these years
Don`t let your heart, hold any tears.

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I have more patience with animals then i do people