Welcome to the boards... good to get more Toronto people on here
With regards to the SFS, I was taking the old type of pro-diem with psyllium and acacia in it but they've stopped making it, so now I take the metamucil capsuls. When I first started taking them , the D went away prtty quick but I'd get cramps every once and a while. I continued taking them and now things are pretty decent.
I've found in general with IBS that you have to try things out for a little while before you can tell if it's working or not.