Oh I understand you.
I was all churney before our scan too, and I've been quite relaxed, never had any thoughts that all might not be well. Hated the MS obviously but never a concern that little B might not be ok in there.
I was excited, terrified (made DH drive as I didn't think I would be safe!). But it all got better as soon as I met the nice lady doing the scan and it really was amazing.
Nothing you can do really, except hope the time goes quickly and you get past the panic and into the Yay stage. Sorry.