Rob -
There's wisdom in what these guys are saying. I just got off II duty, so I know exactly what you mean about drill weekend being a huge trigger. But, I found it to actually work the other way around: the first 2 days, you'll be so pumped with motivation and adrenaline, the cravings will barely bother you. After the motivation dies down, the mind games come into play. I also read an article on this site that stated impromptu quits are statistically more successful than planned quits.
So, check it out: flush it today, use the early motivation to power through the weekend, and for the next month you can remind yourself that you've already made it through your biggest trigger, so you can handle anything.
Or, you can do it your way, and here's what's gonna happen: You'll dread going back home after drill, because it'll be the end of the fun. You'll dread next drill weekend because it'll be your first drill without a lipper, and you won't know if you're going to make it.
Dread leads to fear. Fear leads to anger. Anger leads to hate. Hate... leads to suffering.