Ok, it sounds kind of like you're a maintenance drinker, so I can see how you might have a hard time with an AF day at this point.
Now, one thing to note is that 50mg of Nal is only going to cover you for 12 hours, so if you get up the next morning and have some shots, you're unprotected and driving yourself in reverse, and that's going to make difficult for you to win. So you would need to take a Nal when you wake up, then wait an hour and have the shots. That dose will carry you till your evening session. You may find that you don't care to drink as many shots during the day, but you may have to force them down to keep the edge off anyway, you will have to see. Best to start the extra dose on a weekend when you don't have a lot to do, just so you can see how it works and how little alcohol you can get away with. Well, I may be preaching to the choir here, but you haven't said you take a 2nd dose, so I thought I would cover that issue.
I'd suggest you send an email to
Joanna@CThreeEurope.com . She's a certified alch counselor and is a TSM'er herself. Over in the UK, it's frequently required patients have counseling set up before they can get Selincro (which is their version of Naltrexone), so CThree Europe volunteers to provide them with formal alcohol abuse counseling. They also provide informal counseling for TSM'ers here in the States. Anyway, Joanna has quite a bit of experience and I think she could give you some very good guidance on how to proceed. You may also want to set up an account at Options Save Lives, as she often posts over there :
http://optionssavelives.freeforums.net/I go by the same name over there, btw.
So, there you go, what do you think?