6 weeks pregnant with my 3rd severe morning sickness

Hi so I've had really bad morning sickness since I was 4 week's pregnant I'm 6 weeks pregnant today and haven't been able to keep anything down for days started some anti nausea meds two days ago and it's not helping like at all...I've tried to have soup I've tried toast crackers everything I just can't keep it down was never this sick with my first two pregnancies any advice on what I can eat or what to do?