First things first - breathe. It's very easy to forget to relax as you get down to the wire. I'm three weeks out and have to remind myself to calm down.
If you haven't already, I'd look into getting a binder/wedding planning book that is very detailed in terms of wedding planning to-do lists. I went into my wedding planning absolutely clueless about what all it entailed and my binder helped keep me focused and reminded me of the small things that I would've otherwise not thought about.
Are there any specific areas where you are afraid you are forgetting things? It's hard to tell you what you are forgetting if I have no context and I would like to help.