Surprise! It's twins! my story & feedback please!

Jennifer
It's my third pregnancy and I had an ultra sound on Friday, found out it was TWINS! 
I've been sick with HG since I was 4 weeks and we couldn't understand why since I had never experienced that with my first two sons. I had lost 10 pounds in a matter of days, was in and out of the ER and was unable to do any of my daily tasks. I just assumed this one must be a girl. Fell in shock, when I saw two sacks! I'm so nervous because I know having twins automatically puts you in the high risk pregnancy category. 
Anyone have any twin stories?! And how far along did you make it?did you experience HG?  What was your experience like carrying two babies? And are women able to deliver twins vaginally vs c-section