What To Do If Am Thirsty, Hungry Due To Vomiting After Getting Molar Removed During Pregnancy?

Hi I had a 2nd molar removed yesterday due to bad decay and emmence pain. I am 5 months pregnant. I got local novicaine. After I got home I started feeling very weak and in a lot of pain so I played down for a few hours. When I woke up I tried eating some mashed potatoes but was only able to eat about 4-5 small bites. Within minutes I vomited it all up. I layers back down and slept a little more. When I awoke again I knew I was dehydrated so took a small sip of warm Gatorade and instantly threw it up. I vomited roughly 3-4 more times that night before going to bed for good. The next day I awoke feeling very weak and thirsty and hungry but still nauseous. I managed to eat 75% of my breakfast before running to the bathroom ns vomited. Since then any time I drink or eat I can't keep it down longer than 1 minute. I'm very thirsty wear cold and hungry naseous. What is wrong? Should I go to the ER?