moonmirror-
I am in the same boat. I've been doing this diet since the last week of February, so about a month now. I did great in the first phase and really slowed down in the second.
However, you may feel a little better if you take your measurments. I noticed that I lost two inches even though my weight had not gone down at all. It sucks to be in a slump. I had a bad weekend last weekend and cheated all over the place. And I learned my lesson!! Major headache and stomach problems and pounds have come back!!! Depressing.
But for some reason, on South Beach, I felt able to get up the next day and start over again. Which is a good sign, i think.
Keep with it, it's hard but it's worth it.