crippled - timing could be worse

I blew out my knee on Tuesday. I spent the evening icing it and the next morning it looked baseball sized and almost as firm - I couldn't bend it far or straighten up completely. Went to work to pick up some reading and then went home and spent the day in bed alternatively icing and compressing. I got a new ice pack whcih is really cool...in more ways than one. It looks like one of those old headache bags with the screw cap that you put ice in - but also comes with a large neoprene thing with straps that fits over it so you can velcro the whole thing to your knee, ankle , elbow etc...and it doesn't slide off!
On Thursday I spent much of the day seeing the Doctor, getting x-rays and making bookings to see the orthopedic surgeon.
Its a lot better today, but the problem I have is that I'm getting injured regularly when walking on flat surfaces in straight lines.
When people say "what did you do?" my response is "nothing". So I want to find out whats really wrong inside the old knee & make sure its not something that 10 years from now they'll say "oh we know whats wrong, you should have got it fixed a decade ago, its too late now."
And the timing could be worse - at least I don't have to run for classes and stand up in front of them at the moment. It might mess up the planned field trip though.