I think ur gonna have bad days & good days, some days I was vomiting 3 times a day & couldn't eat anything, other days I wont vomit at all & I can eat, it gonna be that way til about 13 weeks, I'd have 2 good days & think yay I'm getting better then the next day will be the worst day yet!! Stay strong! It feels like forever i know but it will get better!
You'll have your good and bad days. If you think you're dehydrated though, you need to see a doctor and get rehydrated. Dehydration is very dangerous while pregnant.