As I said before, I really have noticed that my cats have an ability to help me relax and focus on the positive things in life. Beowulf is particularly good at sensing when Liz or I need him and coming to sit on our legs or lean against us.
Yesterday, I had a sore wrist and he came and sat with me and, as I stroked him, the pain seemed to decrease. It was all psychological I'm sure, but it still felt good. When I stroke him and feel the vibration of his purr, a lot of stress and pain leaves my body.