Nope.
Though I can't pretend to have an understanding of truly long term, pervasive pain, I got a big eye-opener with an injury about 8 months ago that caused some muscle damage that is resulting in long-term pain with no timeline for relief (for the medical junkies - the injury caused about 8 myofascial trigger points to form in the muscles around my shoulder blade. These are the same type of trigger points associated with fibromyalgia, or at least related, but limited to a single area). I keep going for various treatments, most of which make the pain temporarily worse and then give little or no improvement. There is no ETA of when it will feel better, though for a lot of patients it just goes away one day.
Given my activity level, it has been brutal...even reaching above my head to put on a shirt is nearly impossible on bad days.
But - when I feel this way - I remind myself of how much better I feel overall with less weight and a healthy lifestyle. Sure, I'll be in pain for heaven knows how long...but I can't control that at this time. What I can control is the other stuff that, ultimately, makes my body feel better over time...healthy habits, clean food, and getting as much movement as I can.
Again, since the area is limited, I can't pretend to know what it's like to have pain over wider areas, and I imagine it makes the good stuff harder to find...but it IS in there. Take control over what you can, and accept what you can't.