I too have this problem. I spoke to my Chiropractor about it last Wednesday. He said that my collarbone was being affected indirectly by my shoulders that frequently dislocate. My ribs also tend to occassionally sublux. He couldn't confirm whether my collarbone is subluxing but it's definately related to EDS/HMS.
He gave me some ultra-sound treatment and did some gentle manipulation work. I've been fine ever since. I saw him again today and he did the same. I feel so much better in that area.
If I were you I would ask your GP for a referral for physio. It's not something you should leave in the hope it will correct itself. You wouldn't want to be in Hevsie's position.
Good luck.
Trina
