I think what you get out of it will very much depend on your attitude going into it.
The course is likely to be based on helping you manage with your pain rather than getting rid of it. Modern medicine is pretty rubbish at dealing with chronic pain, simply because there just isn't an easy fix. Have a look at this video. If the video makes you feel a bit pissed off and like you are being fobbed off then that attitude is likely to make the course less helpful for you, if the video strikes a bit of a chord and makes sense then the course will likely be very useful.
https://www.youtube.com/watch?v=C_3phB93rvI&t=43s