severe weakness...

Elena
6w6d today and have all day morning sickness for over a week now. No appetite, extremely weak and dizzy,  racing heart beat and short of breath when trying to stand up... had to cancel work today as I'm not feeling safe driving and caring for kids anymore. Feel like I can't function normally - is that a sign to go to the hospital? 
I try to drink lots of water but can only eat like a small apple and two cookies a day which is obviously not enough for a human being.  
Husband just got home from night shift and sleeping but knowing that he's leaving tonight for 4-5 nights is freaking me even more. 
What should I do?