Hi Marianne - no you're not loopy! Your feelings are very normal as you scramble your thoughts into logic and everything into perspective, easier said than done when you roll from one diagnosis to another! We are all here to read and offer support where we can. Kath has suggested the Cancer Council counselling service, you may find benefit from this. I am sorry that your cat is not here with you now but maybe another cat will help you through as well as - company for each other! Not knowing which State you are in but here is the link to the Victorian one,
http://www.cancervic.org.au/how-we-can-help/phone-support - you can always google to find the right one!
Also on this site there is a multitude of information and if you're muddling through the staff will certainly help you!
Take care x