Stick it out. This kind of thing (low sex, antagonism) is normal for couples around the 10 year mark. There are stages to marriage and this is a big one. If you can get through it, I promise you will both be very happy for it.
Other than some bitchiness on her part (and some neglect and frustration on yours, I'm sure), I don't see any real deal breakers here. Don't listen to the naysayers who either a) aren't married b) haven't made it through this period or c) are divorced (either them or their partner). Today's society is such a disposable one; there is value in sticking to one's commitment and working through problems.
FYI - I've been with my husband 20 years. First marriage, both of us. We went through a crappy period several years ago. Made it through; very happy now.
Read this, then post your thoughts. I have some advice for interacting with your wife when she gets all negative as well.
[url=http://www.songtime.com/sbc/sbcfivestagesofmarriage.htm]Five Stages of Marriage[/url]
Second thoughts can generally be amended with judicious action; injudicious actions can seldom be recovered with second thoughts.
--Cyteen by C.J.Cherryh