Dehydrated

Apryl
I'm 12 weeks today and went my first day without anti-nausea medicine (diclegis)....it was awful and I haven't eaten all day. I had a little over half a bottle of water and just tried to drink a smoothie but after a few sips I threw it up...I know I have to be getting dehydrated and on top of that I have gestational diabetes already so I'm not really supposed to be skipping meals. I got my medicine refilled so I'm hoping it'll kick in...but my question is - at what point (if any) should I call my doctor or go to the ER? I'm just worried about getting too dehydrated and depriving the little babe