Losing weight can’t eat

I’m 15 weeks and I’ve lost close to 20 pounds about 6 in the last week. I’ve dropped three dress sizes. I had to buy new clothes because my pants were falling off. I haven’t been able to eat or drink much in the last 48 hours. I had a popsicle yesterday and I still haven’t been able to eat today. It’s a mixture of nausea and no appitite. I’m starting to feel it though. I’m exhausted and dizzy and super weak. I had gained probably 10-15 pounds at this point in my first pregnancy. Is anyone else dealing with this?