Lower back discomfort, lower abdominal discomfort like it's being ripped apart at times or stretched, queasy stomach. low grade fever.

Some possibilities: If one has very uncomfortable tummy pain, and is normally in good health, plus is not pregnant, the possibilities include: appendicitis (usually has fever), gall stones, kidney stone (very painful), constipation (crampy), stomach flu, etc... Most people with "moderate pain", meaning more than mild pain, need a doctor's evaluation to be sure it is not appendicitis, which would need surgery.