Should I go to ER for not eating for three days because of nausea and vomiting?

I've ate 1 1/2 piece of toast, a couple of crackers these past three days. And anything I eat makes me vomit and I'm super nauseas. I haven't had an appetite either and I three up a lot
Should I go to ER for not eating for three days because of nausea and vomiting?
Post Opinion