I totally second what lemon101 says: there's a bit of normal worrying, and there's a level where fear gets into everything you do (or don't do) - and you should see about getting help for that.
I know what you mean about feeling detached from your body. I feel something like that too because it's hard to understand what's going on in there! It's so complicated and important, and yet I can't direct or control it. And now that the morning sickness has stopped, there's no sign that I'm pregnant apart from the rather tight waistbands.
As far as I feel, pregnancy is not magical. There are no rainbows, unicorns, or singing bluebirds! So far is a collection of occasional strange feelings in my middle, and people saying congratulations to me.
Have you signed up for the weekly NHS emails (www.nhs.uk/conditions/pregnancy-and-baby/pages/pregnancy-and-baby-care.aspx?tabname=Pregnancy)? These are really good for telling you what's going on with the baby and advising you what you should/shouldn't be doing.
Basically, if you're following the guidelines on eating, caffeine and alcohol, you're doing fine. The internet has lots of advice about other stuff, but IMHO if the NHS don't advise it, I don't have to pay attention to it because it's probably rubbish. I know that it is possible for me to take every bit of advice and do everything 'right', and still for something to go wrong. On the flip side, it's possible to do pretty much everything wrong and to have a healthy baby. Not that I'm saying you should hit the crack pipe and line up the Jagerbombs!
So just two bits of non-NHS advice. One from me: control what you can, and let the rest go (easier said than done). One I stole from somebody else on Mumsnet: don't ever Google anything ever if you're worried about it!
I hope your spirits improve soon!