Nausea, when to contact Doctor?

Britt
I have been nauseous and haven't been able to keep anything down since 3pm yesterday. I had some white rice that I've kept down about 45 min so far but that's about it. When should I contact my doctor about the nausea? What can I do to stop it? I've been eating small meals, drinking ginger ale, eating mints, lying down, got a seaband, etc.
Thanks for the advice and help in advance!