Husband doesn't want me to go to ER for vomiting

I told my husband that I want to go to ER because I'm concerned I'm dehydrated. my head won't stop pounding (4days now) my body is so sore from vomiting. this is my 3rd pregnancy and have never felt this sick, I just want to ensure I'm hydrated... maybe I can get a bit of relief. He thinks I need to suck it up. I get it, this is true pregnancy symptoms. Am I overdoing It? is that a waste of medical services. my ob does not do hydration in office he sends to hospital. -10wk5d. UPDATE: at hospital and sure enough I'm very dehydrated, they called my ob and want me to stay for monitoring... feeling way better. left husband at home with kids told him to get them ready for school and deal..., sooo glad I came in, thank you for the nudge. the doctor and nurse both said hydration is very important and coming to ER is a good decision, if not could lead to more serious complications. 😔🤢 Zofran is life!!!