I am sorry you have to face this. I encourage you to explain the rsd to both your gi and surgeon doctor. It is very key that they have knowledge of this condition. You would be surprised at how many doctors dont and want say that.
There are some procedures and conditions that one must do and some that there may be other alternatives. I am not familiar with this condition so I guess I would see if there is a choice even. You may want to get another opinion as well.