Dehydration while pregnant

Has anyone had to go to the er or almost have to go for dehydration? I’m currently 12 weeks and have had a pretty bad headache for about 3 days now. Every time I stand it throbs like a mf. It was hurting so bad yesterday it made me throw up😭 This pregnancy has been SO different than my daughters. I feel sick 24/7 and can barley eat stuff sometimes. I try to drink as much water as I can. I have a doctor appt with my pcm tomorrow so I’m going to see what she says. But just want to see if anyone else has had this happen and eventually got better or had to have an iv put in? And everything end up being okay with you and baby. TIA💗