Replying to Whast wrong with my ankle!?!

my foot has been messed up since August of last year. I don't remember injuring it really badly, I might have bashed my heel pretty hard but thats the only thing I can come up with. I skied on it all season and survived but I didn't hit any jumps and took alot of pain killers.
For about three months starting in January I went to a physio, I now have orthopedics and really good shoes for my feet but it hasn't helped much.
iv gotten two X-rays with nothing coming up, one bone scan showing there is something wrong but not what, and one CT scan showing nothing. Now my local hospital is telling me I need an MRI and I have to go an hour away to another towns hospital for that.
I haven't been able to run without looking like terry fox for about 5 and a half months now, since November I haven't been about to walk a very long way without limping, and in the past 3 weeks I get such a bad limp and stinging/pulsing/ acing/burning pain that I have to sit down for a little wile.
i'm really sick of it, all the limping is starting to mess up my knee, I have noticeable muscle loss in just the one legg, and people bug me all the time about limping around. I normally am a very active person but now I have to miss PE and ride a stationary bike for half the class so my leg stays strong.

I'm guessing its a long shot because of the luck iv had, but has anyone had a messed up ankle or just bone/ muscle/ anything like this before, because I'm clueless about whats wrong and so is my doctor.