Gee, I don't know, I am reluctant to give an advice, given what you have said. I have never experienced ES being hard on my digestive tract, except for the rampant runs!! I take it all the time to deal with GB liver pain.
Can you get hold of some castor oil? The packs help, even though you might find it hard to believe!
But it does sound like you need something to relax the ducts....
Have you done any parasite cleansing? Some people have had a release of blockages/spasms etc by taking a shock dose of parasite herbs, but I am not speaking from experience here.
Also! What about a coffee enema?? This would surely help a bit, or even a plain water enema?