Hi,
these days, the Physio approach to Chronic Pain steps away from the 'biomechanical' way of thinking and analysing and follows the path of "bio-psycho-social" training. This often includes Occupational Therapy, Clinical Psychology and activity-based training. It cannot be explained in a few simple sentences and is best done by Specialists.
Please try to find a clinic that specalises in Chronic pain and undergo their intervention regime. You will need an assessment which determines where you are on the continuum of chronic pain, which then determines training and education.

Continue to go for walks. This is very important.

Good luck,
Fyzzio