A few years ago I was admitted into hospital with ravaging pain through my pelvis and lower left side just above the pubic bone. After 10 days of monitoring and testing I discharged myself as they couldn't give me anything to manage the pain, even morphine didn't touch it. I asked whether it could have been caused by the Mirena coil and all doctors didn't think it had a connection. I returned to my doctor and asked for it to be removed and hey presto the pain went a day later.
I literally feel your pain and frustration. It took years and assistance from one very good consultant physician from my local surgery before I got an endometrial ablation to treat my very heavy and painful periods. It gave me a new lease of life! Unfortunately 18 months on I have been diagnosed with endometriosis for which there is little on offer to treat the condition other than another ablation or hysterectomy.
Keep persisting - try another surgery or doctor if you get no joy. Constant lack of sleep and pain can literally drive you mad. I felt murderous at times. Chin up, hope you get the treatment you need soon.