Pain Reprocessing Therapy (PRT), (honorary mention of EAET*, Emotional Awareness and Expression Therapy) - saying this as someone with trauma-induced chronic pain. The first time something is starting to make a difference after 7 years of unremitting (7/10) pain (daily headache in my case, tension type ... what you'd label as NDPH).
read The Way Out by Alan Gordon & Alon Ziv, there is a lot of research that went into this. I don't trust anything of this sort unless it's backed by studies and evidence. Additionally, they managed to capture the pain on fMRIs, more specifically in the part of the brain associated with learning and memory. That is huge. If you were ever told that your pain isn't real, they have it on a scan.
The success rate is: 98% of patients improved and 66% of patients were pain-free or nearly pain-free* at the end of treatment. The results held up when checked a year later.
*their definition of pain-free/nearly pain-free being 0-1/10 pain level
If you know anything about chronic pain treatment statistics, you likely see this is groundbreaking. Certainly better than the usual "no cure".
I'm aware that unless you've looked into this, it probably sounds like some kind of woo woo. I initially thought it was BS and closed my tabs on it (like I've said, I've been in pain for 7 years. If there were something, I would've known by now, right?). Read the book, my curiosity wouldn't let me not to (truthfully, thanks to the science and references involved) because the other option was to give up. Read the book.
Don't underestimate your chance. If you commit to it, you can do this yourself. I'm not saying it will be easy but your chances of recovery might be high and would you pass on that? I am doing it myself (I'm already quite familiar with how to do intenional neural rewiring sucessfully thanks to a different instance in my life), I have gone through extensive testing (therefore I know for certain I have no structural damage) and I do fit the majority of the criteria for neuroplastic pain, which is why I believe PRT is the perfect fit for me personally. If you want a practitioner, there are options, but this treatment is incredibly accessible if you think you have what it takes and choose to do it on your own. There are numerous cases who have made a full recovery on their own.
Some of the many interviews I found helpful after reading the book: **int1 <- is my favourite and a good introduction to the topic int2, int3, int4, int5,
+ **Howard Schubiner, MD also has this new book on the topic that you can preorder
int6 (an interview in which the book listed above is mentioned in more depth)
*should imo in many cases be practiced with PRT (after you get a physical assessment)