the bees have better knees then me!

So my knee has been messed up since I ran a marathon in Feb 13', but recently it has been really  bad. I went to the Dr. and he took an X-Ray but found nothing. I find that hard to believe seeing that it seems worse then normal. Without knowing what's wrong I've been very wary about what exercises I do. Squats are killer and running is out of the question. I'm going to start doing flutter kicks and just walk more. Today I've walked 3 miles and man oh man do i miss running but it's better then having to get surgery on my knee (eventually). it took me about 45-1hr to walk it and it was pretty nice and cool, even with the humidity it was nice. I was talking with my hubs the other night and I really just need to go cold turkey with the food, I can't just have a little something here and there cause It doesn't work for me. I've decided instead of saying "I can't have that" I'll say "I don't eat that", maybe a mind trick on myself will work.