My cat has recently died, what can I do to make myself feel better?

My cat died in a car accident only yesterday, I feel so sorry for her and I keep thinking It's my fault but I know it isn't if you know what I mean. I'm not really a cat lover but this cat really got to me, and now she's gone I feel like I should of done more when she was with us. I always think about her but I can't stop crying. What can I do to make myself feel better?