Barretts esophagus and Hiatus Hernia

I had a severe problem of vomitting last year (oct 2006) and I had to get an endoscopy done. The doc told me I had some bacterial infection and I was treated for the same. But he also found a small Hiatus Hernia and Barrett's esophagus. Now for the past one month I have been throwing up like crazy. I throw up even water. I have been scheduled for another endoscopy for next wednesday (28th nov). I was wondering if somebody can tell me what could be possible problem with me. The problem of throwing up is there for the past 3-4 yrs. It starts suddenly and continues for abt 1-2 months and stops. Please help!