I find it hard to believe it's still swollen after 5.5 years. Are you sure there isn't something structurally wrong? If it is truly swollen, yeah, I would get an ortho to check it out.
Here's a post I wrote a few days ago that should help you out:
You've lucked out, you are actually talking to THE MASTER of ankle destruction! I've rolled both ankles more times than I could ever hope to remember.
I would have someone versed in soft tissue work check out all the surrounding areas, e.g. the calves, tibialis anterior, peroneals, etc. Make sure there's no scar tissue built up, and if there is, get rid of it.
Next, focus on regaining proprioception around the joint. This is a great place to use wobble boards and such. Standing on one leg for time, Airex pads, etc. are great as well. Make sure you get both sides equal before moving on.
Finally, the best way I've found to strengthen the muscles around the ankle are via manual resistance. Just have a partner move your ankle in every imaginable direction while you resist.