Hi, Thanks for your question. I do understand your pain and discomfort. As per your history is concerned please follow:- 1)Both can not be given together as there is serious interaction so stop both 2)Try with cortico steroid injection directly inside joint which will relieve pain or 3)Try Radio frequency de-nervation where nerve tissue is destroyed or 4)Try Electrical Stimulation where a probe is placed inside sacrum or 5)Finally you can do joint fusion where two bones joined each other with metal hardware which can relieve pain. 6)Give Hot and ICE compress for pain every two hours 7)Change your sitting posture time to time 8)For pain you can take mild pain reliever [paracetamol-500 only]as pain killer has no role here. I hope I was able to address your query. If you have any further questions, please do not hesitate to write to me. Wishing you all the best. Thanks Dr U N Sahoo