How do you go poop; urgent!?

So, I've been trying to doodoo for over a week now. I went six days without anything and then I finally got a little bit out yesterday. So, I ate Raisin Bran and a FiberOne bar and took a laxative...I still can't go. I need some serious help. How do I become regular? I eat decent, too. I take vitamins and eat at least one fruit or vegetable a day and no fried or fast foods, and if so, only occasionally.