I did W2D3 yesterday, and also did something to my knee, so I'm feeling your pain. I hope it heals up and isn't anything that lasts too long. I'm going to completely give mine a rest tonight instead of doing my off-day walking and weight routine, and hope it's better for tomorrow's W3D1. Otherwise, I'm going to be in trouble.
As I mentioned earlier, I'm also a recently-diagnosed diabetic, and because of this, I'm on South Beach Phase 1 in addition to the C25K. My blood sugar when I was first diagnosed 33 days ago was 316 (and that was fasting for 16 hours). Really, just out of control. Well, over the past 33 days of SB1 and the C25K, I've lowered my blood sugar by really incredible levels. Yesterday after my C25K routine, my blood sugar was 74! I'm really excited about that, because it's well within normal range. It's still a little higher (around 120ish) in the morning before I get any exercising done, but my average is now under 100 for the day, almost every day. If this keeps up, I won't be diabetic any more, and that'll be awesome.
I sure do miss carbs, though. I haven't had more than 10 carbs a day in any day for the past 33 days. No cheat meal or anything. It's been tough, but it's getting easier as I learn what I can eat and how to prepare decent, good-for-you food. I'm on a high-calorie version, because I don't want to lose any weight, but my wife is doing this with me and has lost 12 pounds in the same timeframe. So, for those of you who both want to get healthier AND lose weight, I would highly recommend South Beach in addition to the C25K. The exercise from the running really helps cut down the cravings, and with everything, I have so much more energy now.