My right ankle has been swollen for seven months and it aches a lot. If it's not broken, then what is it?

So, I noticed in September or October 2010 that my ankle was swollen and there was a bruise on y foot and a couple of bruises on my leg (though, the bruises on my leg may have been unrelated. I'm a klutz.) In March of 2009 I sprained that ankle pretty severely and was on crutches for a while. I didn't go to physical therapy or anything. I didn't really hurt it again over the next year, and then the summer before this happened I worked cutting grass all summer. It didn't bother me at all. However, not too long after I noticed the swelling it started to ache every now and then when I walked on it a lot and now it aches all the time. Then, a few months ago I stepped down on it and there was this sharp stabbing pain that went all the way around my ankle and into my foot. I have a really high pain tolerance, but that sent me to my knees. It happened again about a month or two later. I'm getting x-rays this coming Monday, but I'm beginning to wonder what else it might be, because if it isn't some small broken bone or a bone that broke and then healed wrong, I have no idea what's going on. I was wondering if anyone here had experienced something like this or if one of y'all had an idea of what it might be...