Thanks for the replies everyone. I just got back from the grocery store, which has a "whole foods" section, and managed to find some psyllium husk caplets (not cheap!). I was a bit taken by the carb content (2.2g), but realized it's all dietary fibre -- so it should be ok... right?

I just popped a serving (4 caplets) and will hope for the best. Thanks again, all.