Hi, welcome to our site. I am Dr Saumya Mittal, MD. Read your query. That is a very significant question and i appreciate your problem. I will try my best to answer your query You need to meet a surgeon to first make sure that there is no other issue- no rectal ulcer or fissure, that may have developed during surgery. Another suggestion would be to get an MRI of the LS spine to make sure that this is not a spinal related issue. Meanwhile take plenty of fluids and high fibre diet, especially in case you are developing a constipation. Meet a physician for a prescription of pregabalin I hope this helps you. Inform the reports mentioned above/if any other so I can be of help further. I have given you the answer to the maximum considering the information provided. The results of the tests could further enhance my answer to you. Please do understand that some details could be extracted from a detailed history and examination. Please feel free to ask another query. I would be glad to help you. Looking forward to your return query with the details asked so that I can help you further. (If the answer has helped you, please indicate this) Best of luck.