Frustration to the Nth degree

Anybody out there who has ever tried to lose weight can relate to this post. For the last week and a half I have been very focused on losing weight and so far so good, I've lose 6 pounds. I have been VERY strict with calories and have tried to pick it up a notch on the workout front. But I really can't figure out how the human body works. If you remember, on Sunday I was blogging about the steak I was making for dinner. It was great and it fell into my caloric intake for the day just perfectly. I weigh in on Monday morning and I'm up 2 pounds. So I start wondering "what the heck?" Then on Monday we went over to a friends house and my will power let me down and I basically ate a second dinner (with 4 or 5 cookies for dessert), and then there was the actual dessert I stopped for on the way home....a medium milkshake. Thus Tuesday morning, another 2 pounds up! I can at least understand that because I went overboard, but not the day before. I'm now back down to the Monday morning weight, but today my weight went from xxx.4 to xxx.2. Here I am busting my hump, eating just right and working out like a fiend and all I have to show for it is a stinking quarter pound....makes me want to go out and eat a quarter pounder with cheese, and bacon, and fries GLORIOUS fries. But no, I can't. I just keep plugging away I guess it will happen in time. Or maybe I am just supposed to be this weight, maybe I'm not supposed to weigh less? Yeah I like that theory!