My experience with a chiropractor is that he initially made my pain slightly worse...and in the end made no difference at all
It cost me a fortune too because he told me I had to go 3 times a week for so many weeks, and then once a week...and at the end of the concentrated treatment period, I had to go once a month for 'maintenance'.
I honestly think you would get better results from the Alexander Technique. And there are some good physios out there...it is just hard to find them! Good luck with whatever you decide to do