JCJ, sympathies for the cat and bills-yuck. I spent a similar amount the end of last year but she did have her tail removed for that and other care but I wasn't insured. It came on top of spending nearly £5,000.00 (yes you read that right )on my dog earlier in the year. The first grand was covered by insurance.
I once had Russian Blue cat that was v highly strung, have you ever tried Bach Rescue Remedy it works on both my cat and dog when they are stressed. Good job on not sending p*** email. Selling at house is v stressful, I hated having to sell mine. Maybe get a large bottle of the Bach then you can all share.-lol