Frustrated! -- Trying to Look on the Bright Side

What's the point? I've been working my tail off, and I still gained again this week--another .5 pound. That puts my total loss for the month at a big, whopping 1.5 pounds. Lame! The only differences I can pin-point right now are that I started a new workout--the 30 Day Shred--and I haven't been drinking all of my water--but I've been drinking at least 64 ounces a day, for the most part. I guess, to look on the bright side, if I hadn't been trying so hard, it could have been a lot worse and I could have gained for the month rather than lost. I'm just frustrated--enough said.