Thanks for the replies.

Canuck Physio - I did go to my GP about a year ago, and he initially just prescribed anti-inflammatories. When they didn't help, he referred me to a physio, who tried a number of techniques, none of which helped long-term. I was then referred to an orthopediac triage clinic, and the doctor there has referred me to another physio - I'll be seeing her in a couple of weeks. I think I'm starting to run out of hope because its gone on for so long....

Judith - yes, I agree that the Alexander Technique very beneficial, and I'm lucky in having a very good teacher. I think it has helped me in terms of moving around generally, but hasn't really helped with the sitting. Of course it could be that I just need a bit more time - I know its a long process to correct bad habits developed over years, and I've only been taking AT lessons since January.

Thanks again