I started throwing up saturday morning, and continued until saturday night. since then (now monday) i have still felt nauseous. should i go to the dr?

Depends on symptoms: If you only have nausea, but you are able to keep down liquids, you can continue to let the problem resolve itself. If you have other symptoms, like abdominal pain or fever, you should be seen. The fluids you take need to have calories. You can let your craving be your guide as to what to eat. We used to have rules about what to eat, but recent research shows that your body knows what it needs