Hyperemesis Gravidarum (severe morning sickness)

Meagan
It's my second pregnancy and I'm 9 weeks. I spent all evening in ER receiving Nausea meds and fluids thru IV for extreme dehydration because I was unable to hold down any food or liquid for 2 days. I have zofran now to help me eat. It's helping so far. I'm just curious of other stories of Hyperemesis Gravidarum;
Were you sick the whole time?
Were you having boy/girl or twins?
Any advice?!   
I wasn't sick at all in my 1st pregnancy,  trying hard to enjoy this one!