Stop smoking?

I have 30 hours to smoke and i have to tell you that it's very difficult to cut it...
The first symptoms that i had: 1. Wanted to smoke very very much.
                                                 2. Feeling nervous without a reason.
                                                 3. Sleeping only 4 hours (i was waking up every 1 hour).
I think i'm gonna still trying. I know it will be a very difficult 2nd day but i will try to be calm.