Do people know the difference between morning sickness and Hyperemisis Gravidarum ?

After nearly dying with my last preganancy two years ago. My partner and I have just found out we are pregnant again. 
​Two early for a pregnancy test however the level of vomiting and sickness has told us. The Drs have confirmed with a blood serum test and I'm only three weeks in and already on serious medication. 
​Hyperemisis Gravidarum is a life threatening condition that needs constant medication and support. 
​I'm heartbroken  

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