Sorry to hear of your frustration - you know we are all rooting for you! - for your ride in the MS150 and beyond... I know how hard it is when you're really psyched up for something... and then a monkeywrench gets thrown in... trust me, I'm not very patient with this stuff either!
Anyway, I encourage you to scrape some money together when you can to go to see a good orthropedic or sports medicine doc. You know, it can take so long to get in with those folks, it might be worth your while to start exploring your options now! Especially since you're going to be paying for a good chunk of it, you want to be at least reasonably assured that your money is going to HELP YOUR KNEE PAIN. The one suggestion I can make if you do go that route is to check out the doc to make sure he/she is experienced with dealing with cycling related injuries and cyclists.