It is time to take care of yourself and, dare I say it, ask for help from friends. The surgery will heal, I don't know if the colostomy is temporary or not but you will get it under control. You are not useless, you are recovering from a major surgery and whatever necessitated it (sorry for not knowing)----and it is OK to cry, maybe they can't "see" you need them because you are ignoring them. It may be that they see you as the helper and can't quite imagine you feel this bad or need some caring.