Understand your problem, as I have had same improperly-tracking kneecaps for some time. Flared up about 6 months ago, when I started a BMF fitness class and running did for it. Sore, init ??? and very frustrating
Fortunately, I could still ride and have had good results from the physio. I can do over 5 mins on the treadmill now, with minimal pain.
It's been a long, frustrating journey but if I can run, jump etc at the end of it all, I might consider it to be worthwhile. We'll see....
I reckon fizzyos these days are pretty good, as they tend to make you do the exercises, rather than massage/manipulate things for you. That way, you have the knowledge to prevent re-occurence and can, to a certain extent, recuperate at your own pace: the more you exercise, the faster you heal - but within reason !!! I tried going hard at the exercises and overdid it, so had to back off.
!
Meanwhile, pull up your chair, warm up your fingers and we'll look forward to hearing lots from you about life, the universe and .....
My sympathies too.