Hmmm. IBS could well be exacerbated by alcohol and inflammation is going to have an impact on your gut, as they both give the intestinal villi a hard time of it. The gut (which has been called the "2nd brain") produces a lot of chemicals that we need, one of them being serotonin. Two things come to mind, Turmeric and GABA, the former helping to calm inflammation in general and the latter being a calming neurotransmitter. Have a look at this review page on Amazon for GABA, one person talks briefly about IBS:
http://www.amazon.com/NOW-Foods-Gaba-75 ... B0013OVZAGI hear that one shouldn't go beyond 750mg, perhaps 250mg caps would be a good place to start. Aside from gut effects, people mention positive mood effects too, so while I wouldn't go tossing the stuff down my throat willy-nilly, seems like it would be a good subject for further research, including a chat with one's doc.
I hope you get the upper hand on the "bug" soon! One day, we'll find a way to get to them despite the fact they mutate so often.