I was given Bentyl last year when I was going through similar symptoms as you. I had a resection on October 1st last year and while hospitalized I was given Bentyl shots tree times a day.
For me, it really helped with cramping and pain. It just kind of relaxed the muscles in the abdomen. It did make me sleepy and relaxed so I would be cautious when you take at first to see how you react.
I still occasionaly take it when my cramping is bad and it does help.
Good luck!