Sorry, without knowing more I might be completely off, but have you tried physio? It took 12 months post birth number 2 to finally have had a physio referral (not uk) that was put in for me a few days after birth by the public health nurse who was concerned by my pain. And now another 12 months on I have used everything I learnt about my body from the monthly physio sessions (national health), googling, one private gyne physio appointment and a few pilates classes (before lockdown put an end to that) to have put together my own 20-30 minute daily exerise/ pilates session that really works for me.
Basically 2 pregnancies with pelvic pain/ SPD made me use all the wrong muscles and I have 'lazy glutes'.
I'm not saying at all that that's what you have, just that it's taken a few years for me to really get to the route of my pain. It really depends on if these pains are from nerve damage or they are muscle / joint pains that will improve with the right exercise plan.
My only advice is to Google as much as you can really specifically the type of pain you have. Follow rabbit holes to find anything out there that describes what you're experiencing. So from my physio sessions I was able to pinpoint the exact muscles that I had weekness in and pain, which might seem obvious, but when I first went to her, all I could tell her has that I had pains in my legs and back when walking more than a short distance. Once I knew the exact muscles, I could Google more specifically, and I found a guy using the term 'lazy glutes' to describe exactly what my problem was. (The pain isn't actually in those muscles, it causes me pain elwhere because those muscles aren't doing their job properly). From there I googled that term and found another guy with a video clip giving his top 3 exeeices for lazy glutes: the first was the clam, which my physio had given me as my number 1 exercise, so I knew I was on the right track. And the other two I added to the exercises my physio had given me to do. My physio also stressed my need to build my core muscles, so I googled the best exercises for that and added them in, and I have occasional lower back pain, so added in the best for that too. I also have a damaged (beyond full repair) pelvic floor, so I also made sure to look up exercises to avoid.
What my ramblings above are trying to say, is that it wasn't one trip to a doctor or one private appointment that put me on the road to recovery, but a combination of everything I learnt, and a lot of time researching it myself.
I was also completely dismisses regarding my pain and pelvic floor issues by my GP (UK) after my first birth and midwives and doctors (not UK) during my 2nd pregnancy. It is a sad fact that you will need to keep pushing, and possibly pay privately if you can afford it at all.