Tedber: we all understand, I cry buckets every time I lose a pet, and this last time, I cried harder than ever before.
I think both your and my reaction is due to the fact that when our parents died, we coped. We had to, didn't we, making funeral arrangements and all the rest of it.
You hadn't expected your beautiful cat to die, so the shock too makes grief stronger, and when a pet dies, we can go right ahead and break down, because we don't have to notify the bank, and all the others that had to be told when mum and dad went.
There's light at the end of the tunnel. Just take the time to grieve.