Anyone gone to er for dehydration?

So I'm 10 weeks pregnant and from 5weeks I've been so nauseous and puke up everything I eat. The past week has gotten worse. I can keep any food or drinks down. I puke all day and night and if there's nothing to puke I puke the yellow nasty stuff. My pee is very hard sometimes has a red look. I only pee probably once every 12 hours or so. Today I have a huge headache and feel so horrible. Is it OK for me to go to er? What will they do to help? What do I tell them when I get there? Sorry for all the questions FTM here

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