Ankle Sprained 6 months ago

Hi.. I sprained my ankle 6 months ago and I still have a lot of pain in it. Most of the time, it just aches a lot and it is really annoying, but sometimes the pain is pretty bad, and the only way it goes away is if I twist my ankle around(which hurts to do) and get it to crack(when it cracks, it hurts a lot too). There is also something that kind of thing that feels like a bone sticking out under my ankle, and it doesn't feel like it should be there. I was wondering what I should do about this. Oh, I also have a very hard time trying to balance on just that foot.