I'm on Yasmin and have been for almost 8 years now! When first taking it, I never had any stomach problems. I used to get bad nausea and get very sick during my periods and Yasmin completely stopped this. However, YEARS after taking the pill, I can no longer drink regular milk. I have to drink lactose free milks. Peanuts also bother my stomach but I've always been that way. It just seems hard to avoid certain foods. I've also started to eat much healthier than I did back when I was younger, so eating greasy foods, like ordering pizza, often gives me a stomach ache. I know this isn't the pill though since obviously it's the greasy foods bothering me! Are you all getting IBS from MANY foods or anything in particular? Just wondering... but I think my case is different since it's only certain foods.
Just remember that most pills can cause headaches or stomach issues, so it's really just hit or miss to see if you get side effects on one or another. I used to get a TON of migraines to the point where I'd get sick. I bought an expensive pair of polarized sunglasses and hardly ever get them. Turns out I just had very sensitive eyes and live in Texas, so the sun is usually out here!