Just a simple suggestion - I play solitaire - doesn't require a great amount of concentration, (which I don't have right now) but enough so that I don't have to think about anything else. I tried those Sodaku (Sudoka? - I don't know how to spell it), but those number puzzles that are popular right now, but they do require a lot of concentration (and a good eraser).
Other than that, I have 4 prayers that I say over and over (I guess a form of meditation) so if you have a favorite prayer or poem or something, repeating it kind of soothes your mind. I do this while I take a walk, or just when I'm sitting waiting on my husband to be treated. It helps. Maybe these suggestions will help you.
Michele