Had it for the last 18 months.
Tried various insoles in my boots and ended up with some from this site. They helped, also got some private physio and do things like stand on the lip of a stair on just the ball of my foot and lower my body down then lift up, also place my foot against the wall with my heel on the floor and my toes up the wall and sort of lean in to it.
It was agony for a year but its just a mild dull pain now.