ACL PROBLEMS! HELP!!?

I am a senior in high school. Back when I was a sopre, well actually the spring of freshman year and that following summer, I tore my acl and my meniscus in my right knee. The first time it tore a little was when I was pitching in softball, the next jumping in cheerleading, and then every single time i would shoot to pivot in field hockey I would feel a tear. I played all spring and summer with it getting the pain with everything that I did. I would rest it for a bit then go back in and play. I ended up getting surgery that September, so 2008, healed quick and went back to cheerlead that december/january and played softball that spring/summer. I had no problems with it until April/May 2010 when I was tumbling and I felt a pop and I couldn't apply pressure on my leg or get it to straighten out all of the way. It took me about 30 mins to be able to stand up from where I fell. Ever since then my knee will pop occasionally. It happened after 3 months then 1 month then 3 weeks then 1 week then it was happening days apart. Now if I sit cross legged and try to come out of sitting like that my knee pops and I am in severe pain. It happens doing the most basic things. I even wear a specially designed brace that I got from a bracemaker and NEVER has it gotten hurt in the brace until recently. It's almost as if the brace doesnt even help. I think I might have retorn my ACL but I am not sure. I know that if I go to the DR he wont let me cheer. Is it torn?