First and foremost you should visit a orthopedic surgeon. The problem you are suffering is PAIN.
Now in your case the pain can be due to chronic instability of the ankle which is most likely due to unhealed ligaments. MRI
will definitely show the status of your ligaments and whether they needs repair or reconstruction.
the second cause ( less likely) can be the degenerative changers in your ankle joint resulting from the abnormal stresses on your ankle joint which you put to avoid pain and instability. MRI can also be helpful in that.
so my suggestion is consult a orthopedician and get a MRI as soon as possible.