Sorry to hear about your leg hurting ... sometimes though, it's better to just "play through the pain" ... I have a leg injury that goes back to Summer 2003 ... At first I thought I had pulled a hip flexor muscle (playing Ultimate Frisbee), after a few days, the pain went away, and I forgot about it. Fast forward to September/October 2003 ... it starts bothering me again, to the point where I can barely walk. I talk to one of the people at my school's health services, they say there's nothing they can do, tell me to stretch out, and take some ibuprofen. Doesn't really help much, but at least gets me to the point where I can walk again. Eventually the pain goes away, and I forget about it (again). Didn't give me any problems for the rest of 2003, and most of 2004 (played Ultimate again Summer '04, with no problems all season), and now in the past week or so, it's started bothering me again. Not as bad this time ... I can walk fine, just a little bit of pain.
I figure I'll just ignore the pain ... it hasn't stopped me from doing anything, and at this point in time, its just an inconvinience, not a major holdup.
(of course, your situation could be completely different, so none of this advice may apply to you)
Congrats on the weight loss.