Frequent Nausea without Vomiting? For the last couple years, I've had very frequent nausea. I never actually throw-up, but I always feel like I could if I let myself. I went to the doctor for it and all he gave me was Prevacid for heartburn. The Prevacide only made the nausea worse, so naturally I quit taking it. I'm emetophobic (fear of vomiting) so could this simply be stress? Me worried about getting sick, therefore I always feel sick? Or could this be something serious. I'm in therapy, and I've been doing extremely well. So I thought that the nausea would stop once the anxiety subsided, but it hasn't. 
The nausea is usually accompinied with diareah, and this happens at least 4-6 times per month. Any advice would be much appreciated!

Summarized question: What is causing Frequent Nausea without Vomiting?