shoulder impingement?

Hi all! I was recently diagnosed with a shoulder impingement...anyone have some exercises I could do to make it better? I swam on Thursday and ended up kicking most of the time or doing some 1 arm swimming. (Surprisingly, it felt a lot better the following day! But its killing me now!) Any advice? I've been swimming for over 20 years and this is the first type of shoulder pain I've had! Thanks!