I'm glad you are home and resting, Flower. That's the best thing you can do....
The next scan will give you more and more reassurance and that "scared" feeling will become less - I promise. It WILL always remain to some extent (and really doesn't leave once you become a parent! haha). But you'll feel more reassured when you see your little one squirming about. Especially when you start feeling (s)he move - it will be amazing.
Re: nausea - there's just no way to predict. The nausea can be HORRIBLE...especially w/ your first - when you aren't used to those hormones in your body. Many times - nausea will decrease after the first trimester.... you'll feel good to great during 2nd trimester... let's pray it goes that way for you!
I've had everything from nausea for just 1st trimester - to hyperemesis (meaning EXTREME vomiting, dehydration, ER visits, etc) w/ the girls. Oh, I don't even want to think about it - yuck!
You'll get there - I promise. Just hang in there... rest as much as possible.... and please let us know how the next scan goes. I can't wait for you to see your little one!
(Oh, and I'm hanging in here. Good days/bad days - just normal stuff for me! Thanks for asking!). Many hugs - Tina