You don't have a case of gastro do you? I had it a week ago and was sure i was in early labour. The lower front and back cramps were getting unbearable and i also had vomitting (but escaped the diarrhoea...but the rest of my family copped that). I ended up on a drip in hospital for rehydration cause the Dr explained that dehydration from vomitting/diarrhoea can cause uterus and bowel spasms and can even bring on early labour if left untreated.