Colectomy is a major surgery and I understand how miserable you are but it's not always the best answer. Please get more opinions. I have had a colon resection due to a bowel obstruction caused by a congenital bowel malformation-- a rotated cecum which I never knew I had until the obstruction. I had 18" of colon removed. I did have chronic constipation before the bowel obstruction occurred but had it under control (mostly) with magnesium capsule supplements and high dose vitamin c. It has taken 3 years to really recover-- very hard. There is a closed Facebook group on post colectomy pain and problems. Several of the folks on the board had colectomies due to chronic constipation and are worse off now. Hope you get better and find a solution. It is truly frustrating and can be disabling.