Help!

We attended a Christening today, and as usual I ate a lot again. Don't really know why, but my appetite has been crazy this past few weeks. I guess because I'm so stressed. I want to lose some weight before we go to Australia next month because as you all know weather over there is nice and I won't be needing a jacket. What's the relation? I cannot hide my bulging tummy. I am desperate and I think the answer of my problem is a weight loss pills for a quick fix.