You have such a complex history like I do so I find that doctors just don't want to touch me. I think it is a good sign that the LIS helped so maybe a second one would do the trick. You shouldn't have to live with this for as long as you have. Even with the risks, there comes a point where you have to try something because you don't want to settle for what you have.
Have you tried any physical therapy for the pelvic floor to try to get it to relax more?
I too have problems with healing. I have a non-specific connective tissue disease. Have you ever been tested for auto-immune problems?
How do you manage your pain? Stress definitely adds to that. I know I carry my stress in my pelvis. If you ever want to send me a PM, please feel free too if there is something you want to talk about off the board ever.