I do not know if you are a candidate for such a radical surgery but I do know that having this done will not necessary "cure" your condition. When I sought advice about colostomy I was told that it would not put an end to the symptoms of IBS C. My husband, who did have the surgery for colon cancer, experiences the same bowel problems that he had before the surgery.
I found that for my chronic C, colon hydrotherapy was the best treatment. It is not a cure but it is palliative. It will absolutely do the job where enemas and laxatives will not. The clinician that worked with me for many months suffered with terrible consitpation, similar to what you described, and only found relief through this treatment. I highly recommend it!
I can feel your pain. I have slow transit and was diagnosed with colonic inertia after eight years of constpation, bloating, and pain. I was taking miralax- 6 caps a day and a new med called amitiza. I failed the sitz marker test and defecography, and just had an anal manometry. I met back with my surgeon and I am schedule to habe a total colectomy on Jan 28. This is a surgery you should talk with him/her about. I tried colon hydrotherapy and it did nothing. I have been on every laxative under the sun and nothing has worked.I have gained unecessary weight and I truly do not look like myself. It is a 3-5 hr surgery. They are doing it laparoscopic and are connecting my small intestine to the rectum. If you have any other questions please ask. I wish you the best. You have to be assertive with your dr.