I feel calmer when I have my knitting in my hands. It helps me think. It's somewhat mindless to keep going around and around in circles on my socks - and fhe finished product is a delight to wear.
Now there's a group in the UK that uses knitting to help people deal with hand injuries and Post Traumatic Stress: Stitchlinks. Here's a post about them from Knit on the Net.
When you think about it, it makes a lot of sense. Simple, repetitive movements, with lots of options for needle position and size, and materials that can make you feel good just by touching them.
I wonder if there's a similar group in Canada?