How do I know if I really did do something to my knee or if it's something that can heal itself over time?

So I'm a dancer and a gymnast... though ancient in both of those worlds since I'm in my mid 20's. Anyway, it's not been about 2 months since I injured my knee at the recital and it doesn't seem to be getting better (or worse!). What happened was I had done what's called a Front Walkover (perfectly) and when I landed I heard my knee pop! And afterwards I couldn't even get back up to finish my dance (gym) routine for the recital. I couldn't put any pressure on it whatsoever! I put ice on it once I got off stage for a bit and then hobbled to the car and went home (I wasn't driving my boyfriend was thankfully). Once I got to his place, I elevated it and put ice on it once again. I did that for the first few days. I also been wearing a knee brace (the kind you can just buy at walmart.). Without it I hobble significantly more then without it, but even with it, it's still difficult to really walk on it properly as well as put normal pressure on it. Is there anything really I can do about it???