My wife is going through a similar thing. She had open bowel resection surgery for colon cancer 7 weeks ago and was feeling pretty good considering the incision healing well, then yesterday she suddenly has very sharp pains in her upper abdomen. We are calling the doctor today and will let you know what they say. She thinks it might be her hiatal hernia which got a lot worse after surgery. She probably needs that dealt with next. She goes back and forth between constipated and diarrhea. She takes metamucil for fiber and uses either Ducolax or Imodium depending on which she needs. Not a fun recovery, we thought she was improving daily until yesterday.