Hospital?

I have hyperemesis gravidarum and vomit all day while pregnant. I’m wondering when I should go to the hospital for fluids? Each time I go to the hospital it’s a 300.00 co pay and last time I went I felt like the hospital staff made it out to be nothing (“oh ur fine”). Went to bed at 9pm last night, woke up and vomited 7 times through out the night. This morning vomited twice and unable to keep my medications down. When am I considered dehydrated or low electrolytes? Any input helps. Thanks

Update: went to the hospital, they kept me for two days because I was so dehydrated. Gave me IV fluids and anti-nausea meds. Went back two days after that for more fluids. I hate HG.