Severly dehydrated? should i go to the er?

Im currently 11 weeks pregnant and vommiting constantly. I cant eat or drink anything at all. Not even crackers, or protein shakes. I tried sucking on a cough drop and i vommited quickly after i got it in my mouth. Im very shakey and light headed. Should i have my fiance take me after he gets home from work or should i wait it out and see? II have been like this for over 24 hours now and i was told with my last pregnancy the dehydration could be dangerous. How bbadly dehydrated do you have to be?