I'm not sure exactly what the specific restrictions of IBS are (lipids = fat, right?), but this Web site might be of use: http://www.fatfreevegan.com/
The originator's (I think she's from Louisiana, too) Web site is http://blog.fatfreevegan.com/
There are probably a lot of recipes you could adapt from those and change the spices as needed.
Can you eat fruit and tomatoes? If you can, you might be able to use salsas (using the term loosely) for flavor - say, tomato + avocado, mango + avocado, etc. without adding a lot of spice.
Do fresh herbs count as spices? Putting some fresh cilantro, basil or parsley in a dish adds a lot of flavor.
Hope you feel better soon!