Do you like doing things with your hands? Do you like building things? You said you like to do yard work in the summer. What if you tried doing something artistic like painting or furniture making?
I'm also a knitter and I spend a lot of time on the computer. I write and I read (when I can concentrate -- I also have trouble with this.) I like to watch movies, naturally. I also get out when I can. I go to cafes or go shopping.
I can't imagine that's helpful, but there you have it.
As to the pain -- I believe definitely depression can cause pain. I'm no doctor though. Talk to your doc about