Hi Michelle, you’re not alone, I feel your pain so strongly! I suffered from the exact same thing for years and I still do, especially in situations (like you said, in the car) where you feel trapped, and like you’re going to be sick, and the fact that you’re in a confined and inconvenient space makes it sooooo much worse! I used to get similar attacks on my school bus for years during high school, and at year-meetings and in class. Id suddenly have this urge, I was positive I was going to be sick any second, I would go all pale and my heart would race at a million miles an hour and I felt really faint. I eventually put it down to panic attacks, but now that I’ve developed IBS, I find it difficult to separate the two. Because anxiety brings on IBS, or makes it worse, or both. So when I get that nausea I try to relax and breathe, and hold myself back from making a bowel movement, trying to discipline my body! I'm just glad I'm not the only once, I haven’t told a soul that I have these problems because I know nobody would understand.