I dunno if this has ANYTHING to do with what's been causing your mood swings, but I know that when I started my program, I was a complete emotional wreck. I mean, mood swings are one thing, but this was on a whole different level. I was screaming and yelling and crying over absolutely ANYTHING. At first, I thought it had something to do with my birth control, but in hindsight, I'm pretty much certain it was just my body adjusting to the complete change in diet. It can be quite the shock to the system if you're going from junk, junk and more junk to the complete opposite! It's strange just how hard the detox can be! If this turns out to be the case, I'm afraid you'll just have to ride out the storm and wait until your body gets used to it (which shouldn't take more than a few weeks). If it keeps up, you might want to take it up with your doctor, or take a closer look at your diet; there could be important things that you're missing!
Or it could just be hormones. Either way, I'm sure it'll pass. Regardless of the cause, keep up the good work with your program, and everything will fall into place, I'm sure