Thanks again everyone; all good suggestions. I do have Margaret's DVDs so that would be an option; unfortunately swimming is out due to time constraints. But yes, it would have been a great option.
Beth- so sorry you've been through this. I am so worried about my knee getting worse- it isn't getting wore, and there is no structural damage (PT thinks it is partly due to a tight IT band and weak glutes, so I have to do a lot of glute work, especially clams for the medial glute). But everything kinda hurts- not agony, but enough to know it's not a good sign.
Thanks so much for your encouragment- much appreciated. I know how frustrating it is when you're fit yet have to work within limitations, like so many of us do. I'm glad you've seen progress though- it gives me hope!