OF course,
Unfortunately back pain comes with more than its fair share of possible sources.
Although I have nothing against, Chiropractic physiotherapists can do the same (as in Grade 5 spinal manipulations ie. "crack of back") Which has its use in certain individuals, but not all.
What I am saying is that thescoliosis may be over-diagnosis, or may simply need confirmation from someone else.
Additionally, I am unaware of the Alexander Technique.
Perhaps you can detail when you first noticed this problem, what exacerbates it, alleviates it. etc.