Sudden extreme nausea

Help!! So I’m almost done with week 15, and I’ve had a sudden and violent uptick of nausea. I hadn’t thrown up in a week, felt good, then 4 days ago woke up nauseous and have been super sick ever since. Thrown up DOZENS of times, went to ER for dehydration (they sent me home after a bolus and nausea meds, which helped for a half a day), and basically feel the need to vomit every other hour. Can’t keep most foods down, appetite is gone. I’m scared. Anyone else had this in the second trimester? Lost 11 lbs in the past three months. 😥🤢