Is It Safe To Take Ondem Regularly To Relieve My Vomiting And Headache At 9 Weeks Of Pregnancy?

I was admitted to hospital for severe vomiting.im 9 weeks 2 days pregnant . Suffering from hyperemesis graviderum .So Dr suggested me to take ondem4 md when necessary not regularly.Bt m continuously vomitting.Doxinate not working,infact after taking doxinate I vomit. Wat to do in dis situation only by taking ondem my vomiting nd headache stops.wat to do now