Ive been experiencing sudden, and almost constant nausea, burping, and occasional stomach cramps on and off for to 7 months now. This all started back in June 2010. The first time it happened, I felt sick and nauseous for about 2 weeks. It finally went away, then at the end of August, it came back again...that time I vomited after waking up suddenly...the nausea lasted for 3 months that time. When I experience episodes, it's usually between 1am-3am. Sometimes the episodes begin with me waking up suddenly, immediately feeling nauseous and like I have to get sick, followed by chills and severe shivering/shaking, then experiencing a feeling of having to use the bathroom. I never have a fever when this happens, so I don't think it's a case of the flu or anything. I've been to my doctor, had blood work, and had an ultrasound done, but all the tests came back negative. I was told it might be acid reflux, and was given Prilosec, but experienced severe stomach cramps and diarrhea, so had to immediately stop taking it. I was feeling fine for a while, occasionally would get a sick stomach, but didnt think anything of it. Then, just a couple days ago...the episodes came back. Suddenly, woke me up, and the same thing again...feeling a rush of nausea, feeling like I have to get sick, and shivering. It wasnt as severe as the previous times, but it still made me notice that something is still going on with me.