helicobacter pylori infection
"I have been taking Prevpac for a week now, and the horrible abdominal pain is long gone. :)  However, I am experiencing rather unpleasant back pain as a side effect. I have been stretching like crazy trying to mitigate it, but it doesn't seem to be working. I am using ice packs and a portable tens unit to deal with it. While not fun, it is a whole lot better than the agony of an h. pylori infection."