I am IBS-A, mostly D and pain too, and acacia has been a god send. If it starts making you C, you may need to increase it. I started out at 1 tsp 2 x day, now I am at 1 TB 2 x day, and I have been taking it for about a year.
It really helps! But, I also found having insolubles at Breakfast with my acacia AND soluble fiber food is necessary.