Hi Pete,
I have seen several people here suggest that we should give TSM at least a year, or even two, before giving up. I have seen a few (can't recall the names now, but on this site) who actually saw changes over a year into the treatment.
The way I look at it,
unless you plan to quit drinking completely, what do you have to lose by continuing to take Nal when you drink? Also, are you tracking your units and cravings meticulously? That seems to help a lot of people (including myself) see subtle changes.
Stay the course!

YG