I'm still recovering from tendinitis in my left shoulder and elbow. I hate it. It's painful, it gets in the way of work, play, and sleep.
I'm still doing a little knitting. I can't quite crochet yet as it uses my left arm and hand a lot. Spinning is completely out of the picture until I'm better.
What I found works well with knitting in little spurts is entrelac, a method of knitting where you get a nice, basket weave pattern. It's fun, goes quickly, and I can put it down and pick it up frequently when I need to rest my left arm.
Entrelac was a little confusing for me at first, but Interweave has a wonderful tutorial on the subject that is free on their website.
I practiced on a test swatch on some Liberty Wool that I had left over from another project. It had some pretty color changes that I thought would look nice with entrelac.
So that's how I'm keeping sane during this physically painful time. Entrelac enabled me to keep working at something I love and be able to rest what I need to take care of.