get yourself to a chiropractor, they will (if they are needed) make you a set of orthotic footbeds which set your ankle up properly... they hurt till you get used to them, but long term they are a lifesaver.
i have a detached ligament in one ankle, had a duff hip at age 12 and rubbish knees keeping them apart! and wouldnt be without. they might cost 200 quid, might be less. or from a camping/ climbing type place there are insoles called superfeet which are an off the shelf alternative. if they fit, they are nearly as good, but only 50 quid