Mine were caused by adhesions from previous surgeries. (I had 4 this year). The last surgery , 1/07/19, they started to try laparoscopic but when they saw all the adhesions, they switched to open and spent the first 2 hours clearing the adhesions before they could start the actual bowel procedure. Ended up perforating the small bowel during that and had to fix that too. I am now 2 months post surgery and everything seems to be passing through ok so far. The liquid nutrition I have mentioned in previous posts are good, plus the gentle abdominal massage . I wouldn't be surprised if they put you on a low residue diet.
Good luck and feel better!
Also, I hate the NG tube as well, but it does work. Had 4 of those this year too! UGH!