feeling sick

I didn't know first pregnancy could be this harder... no one warned me about all the possibilities. I felt great at first and obviously over the moon when I found out that I'm pregnant with our first child. Now things are different. I lost 4kg in a week time due to vomiting n lost of appetite. I can hardly eat anything and only surviving on fluids. I got admitted in hospital 3 days ago and I literally bagged them to keep me there overnight as I don't have any energy or anyone to look after me as my husband working 2 jobs. I feel very lonely and wanted to giving up on this pregnancy. I don't know what to do.