9 weeks and sev nausea

Judy
I am pregnant with my 4th and experiencing very sev nausea 
I was in ER the other day and required hydration and think this will continue 
I haven't been pregnant for 12 years and don't recall feeling like this with my other 3 pregnancies
I try and eat but it's so hard right now- smell, look, etc with food scares me 
Hoping once first trimester completes this will pass