How to deal with this?

So I'm feeling better.

Not that I've magically dropped 10lbs, but for the first time in a while, I'm starting to feel like I can get my head back in it. However I know I'm looking at a lot of calories tomorrow. And part of me just wants to partake.

Tomorrow is my last day as a receptionist. Probably (hopefully) forever. I've been at my job since August 2011 and I'm really scared and excited for my next step. Some of my coworkers are taking me out for drinks tomorrow night at a little pub across the street... and I want to partake! I know my office will throw me a "surprise" goodbye party... and I want to partake!

Part of this harkens back to my "spoiled" eating pattern. I WANT IT SO I WILL HAVE IT. Though it sort of boils down to the fact that I CAN'T have everything I want, right? If I could, I certainly wouldn't be in this predicament. So how do I deal with myself?

I think I can count on cupcakes being my goodbye treat. I could have one.

And then just drink light beer with my coworkers?

It feels so weak! So lame! I want to celebrate. I like FUN eating. I like CELEBRATORY eating. Light beer? No! Margarita time! Mojito time!

Alas.

Time to email Christine, I fear.

Part of me also feels like I DESERVE it because I went to a yoga class this week (my first bout of exercise in a looooooooooooooooong time). And I feel every ounce of every muscle of my body. I can hardly walk. It's borderline pathetic. To be fair, it was a HARD class and a really challenging instructor. If it was slow-flow or a beginning Hatha class I probably would've fared okay. This means I can scarf down cupcakes and drink copious amounts of alcohol... right?

Any tips on how to deal with "spoiled" impulses? Is there a compromise that can keep me happy?

EDIT: Christine's Advice
Just eat salad for lunch one cupcake, and salad for dinner with some chicken or tuna of fish or egg white omelette, to bring calories from the rest of the day way down!