I would never call an ambulance for d&v, with the exception of my middle daughter. She had a fundoplication (stomach wrap) operation as a toddler, so vomiting can be extremely dangerous for her, and I dread the winter vomiting bugs as she often ends up in hospital having her stomach drained to prevent her trying to vomit. Norovirus, with its uncontrollable projectile vomiting is one of the worst, as she risks rupturing her stomach or her oesophagus, or both! Given her problems, I have (once) had an ambulance called for her (by our GP), as she was is such agony and the risk of rupture was too great given that we were a 70 minute drive from the nearest hospital. That said, the rest of us follow the usual route of plenty of fluids and rest!