Creative Block

I'm working on a fundraising video for some missionary friends today, and my brain is completely racked. The idea for the video looked great in my head and on paper, but as I put it together on the computer it looked like garbage. So, it has been back to the drawing board for me, for most of the afternoon, and nothing is coming to me. This isn't a problem I'm used to. I can usually just sit down and whip something out that looks good. It's getting stinking frustrating. I'm right back to where I started about 7 hours ago. I don't know if it's the pressure of what this is going to be for that is getting to me, or that it's a different style than I'm used to, but I'm stuck.