Twins and sickness!

So I found out yesterday at my 8 week scan that I am having twins. HUGE shock! Twins don’t run in my family nor do they in my fiancé’s family. My nausea has gotten worse even before I found out, but now I can’t keep any food down. Everything I eat, comes back up, even water. To a point where my body is trying to throw up but there’s nothing left. Has anyone else experienced this or is it something I should be contacting the hospital about? I feel so weak and my stomach is definitely telling me I’m hungry!