Sickness

So I'm 17w 1D. For the past 6 days all I've done is throw up. I thought it was a stomach bug but some of the days I could eat anything and be fine just get sick when I woke up but other days,like today, I couldn't even keep water down. My OB says to go into the ER and they will IV me, last time I went I ended up leaving in worse condition. I just don't know what else to do, they say baby is perfectly healthy and I've lost almost 10lbs in 6days because of it. 😔