So sorry to hear about your kitty. Yes.... I too have had to deal with the fast unexpected death of my 6 yr old siamese Pricilla. It was amazing how she was totally fine......as I thought fine and then on a Friday my husband and I came home from work to her crying she wouldn't stop she just carried on all night long. So in the morning we brought her into the clinic and the vet was not sure what was wrong with her and then she had a seizure a small one and to us that was extremely strange. Pricilla was NEVER that scared to come to the vet. But that vet was almost sure that was what was wrong with her. So she sent us home to observe her. Well one seizer lead to another and another and finally on Sunday she went into a straight seizure so we were sent up to the University where she would be handled by a specialist they did tests and spinal tests everything and nothing showed up they wanted to do a Cat scan (Literally) but they didn't think it would show us anything that would change her fate. So I actually held her as they put her to sleep....... It was totally aweful but I owed her at least that much. I still don't know what happened I wouldn't allow them to do an autopsy on her I didn't want them cutting into her. I needed to know that she was treated humanely up to the time I received her ashes.......Our loved ones always understand that we loved and cared the very best for them..... You can not blame yourself for your kitties untimely passing. Just know that you gave Scooter the best life any kitty could have he was loved and cared for the best way possible. I understand the loss you are feeling its been almost 2 years and it still feels like yesterday. I hope this helps its understand how hard this is...... Welcome to PT there are some wonderful people in this forum....Many that will help you with your loss