Hi, L Have Had Severe Chronic Pain In The Pelvic

Hi, l have had severe chronic pain in the pelvic bone, I broke my spine 34 years ago and had an operation where bits of bone were taken from my pelvic bone and grafted into my spine. The surgeon damaged the nerves and since then I have suffered horrendous pain every day, sometimes screaming in agony, I have been prescribed all different painkillers none of which make much difference. Is there anything that you think would help, It would be much appreciated.