Action on pain is a brilliant charity which provides support and advice for people affected by chronic pain, http://www.action-on-pain.co.uk
It has articles about chronic pain, creating a pain plan, different types of pain and pain flare ups. All of which I personally found very helpful.
The support and advice section includes therapies and publications and a very interesting read from a pain psychologist.
Other articles included one on raising awareness of chronic pain in Europe and a bill of rights which you can sign to help improve the life of those people affected by chronic pain.
There is also a section where you can share your personal story about your chronic pain and even a section where you can capture the sense of chronic pain through photography.