ACL Reconstruction 6 months later

I had ACL reconstruction in January of 2009 on my left knee. I went through therapy and everything seemed to be doing well or so I thought but I have swelling around the knee down to the ankle and it feels like something is jammed up in under my kneecap. I still can not kneel on the knee or run and going up more than 2 flights of stairs is torture. Every now and again I get a sharp pain on the left side (outside) of my knee that almost feels like a small bone snapping and I get pain under the kneecap. I just had an MRI done again and it showed fluid around the knee and swelling but it was kind of left at that. I was told to give it another month but that month has almost gone by and I feel worse every day.Any suggestions as to what may be causing this or is this normal? I actually felt better than I do right now the day after I had surgery done.