Welcome friend. 100 beers a week is pretty high, but just so you now I was at around 80 just over a month ago and haven't had one since. It is possible, so keep that in mind if you start doubting it. I did nothing special, I just stopped. I deal with my emotions, how to spend my time, and always keep in mind why I don't want to drink. It is for sure a new thing, but new in this case is a GOOD thing in my experience.
Post all you like here, you are not alone and we will get through this together. I don't know naltrexone myself but hang on, someone will be along shortly that does. Either way, fight your fight and know everyone here is right beside you in your fight. We don't leave anyone behind, unless it is their choice.