The therapist told me that my case was unusual to him because my left hip and left shoulder were both higher. He said it's much more likely for people with a higher left hip to have a lower left shoulder.
I found the massage therapist through word of mouth of other runners in my area. I actually went to two others before that I didn't think were any good. What area do you live in? I'm sure you could get a recommendation for a decent one on this site.