Sand - Thanks for taking the time to reply to my post. I appreciate all the help I can get!
That thread about people who have trouble identifying triggers was very eye-opening. It seems that others have also tried for years to find out what their triggers are. The triggers for IBS-C and IBS-D can be quite different.
You may be right about me taking too high a dose of acacia to start out. 1/2 tsp. just seemed such a tiny amount (compared to other fiber supplements I've tried), I didn't think it would make any difference. I have lowered the dose and will see what happens.
As far as insoluble fiber goes - I do eat foods like soft canned asparagus but I really get very gassy if I eat even well cooked veggies like broccoli and green beans. I eat sweet potatoes, yams, carrots, parsnips, celeriac, yucca root - lots of soluble fiber and vitamins in those. I do eat one slice of sprouted 20 grain bread each day and that has quite a bit of insoluble fiber in it. I also have a tablespoon of freshly ground flax seed in my protein shake which I think contains both soluble and insoluble fiber.
By the way, last night I had relatively little pain, so I'm keeping my fingers crossed that I'm doing something right!