You don't need to get any treatment, depending on how bad it is, what I would do is just rest it even if it means using crutches but try not to walk on it and stay away from gym/sports for at least a month. If you can strap it and when at home do castor oil packs on it with a heat pad or hot water bottle, it opens the pores, thins the oil and works faster, do this several times a week for a couple hours at a time, its got amazing healing properties in it. look up castor oil pack on google or even you tube, remember its oil and stains clothes carpets bedding etc, to clean after use sodium bicarb and warm water, only use organic oil too.
Also if possible if you can get it, buy some arnica cream and tablets, its good stuff and will help to heal along with the oil, great for bruising and sprains. You could probably buy it all online and get it delivered.
Good luck and let me know how you get on.
Unfortunately you may have a slight weakness in that ankle so will have to be a little more careful, mine wasn't great for years but haven't had a problem for over 10 years now so hopefully all is fine. I sprained my back, OMFG that hurts so bad, ended up doing all this treatment myself and so far its been fine, just being a little careful for a while.