Believe it or not, that anxiety and sense of foreboding are largely caused by the alcohol itself and as it gets out of your system, odds are good those feelings will go away.
SOME people have an underlying anxiety condition and SOME people suffer from PAWS, but please don't let these seeds get planted in your head that this is how it's gonna go down for you. I felt FANTASTIC after a short while of sobriety -- anxiety and jitters all gone. Lots of other people do, too. Of course, more people will post to report a problem than to say "No problem. Feeling great."
Keep all that in mind, and expect the best for your recovery! :-)