Many have posted problems of extreme nausia and heartburn like i also have. From my experience drinking water and even boiled water doesnt always help and people get to the point where they break the fast because it all becomes unbareable. In situations like this it maybe a idea to continue fasting but have few glasses of boiled water with fresh ginger added. Retention of bowl waste and wind are usually culprits in causing these symptoms at extreme levels and usually afects those who are new fasters that have alot of junk packed in their system. Soon as the severity of the symptoms pass go back top pure water and it should not reoccur (well not at levels that call for more ginger)