I've had my cat for 4 years and she has been of the sweetest cats ever. She loves kisses and getting hugged when she's on my lap. She's never been violent towards me or another person/cat. Yesterday she sat on my lap like she usually does when I sit in the dining room doing my homework and when I patted her like I usually do, she viciously attacked my hand biting and scratching not letting go. I have two big gushes and it hurts to use my hand. I am heartbroken and feel betrayed at her attack. I cannot trust her anymore unfortunately, but I can't imagine leaving her with someone else that isn't me because I know that no one will care for her just like I do. What should I do? I want to take her to the vet but it'll cost a lot for just a visit I think. What should I do about her behavior other than taking her to the vet?