I am also having this problem which surfaced a couple of years ago. A close friend of mine told me he had an episode of this pain and he suggested I do the same thing he did. He went to his chiropractor who did an alignment of his spine which straighten his gate when he walked. I did the same and hadn't had anymore problems until now. I work in the oil fields in Colorado and for the last 3 weeks it is all I can do to move around. Heading back home to Texas today and first thing I do is go see my chiropractor. The allignment gets rid of the pain.