Just a couple of thoughts for hikergirl and anyone else interested going through my head. I'm not sure what a Nal-over really is since I have not ever had one. I sure as heck know what a good hangover is though

First of all I think when one is contemplating starting TSM one has to think of it as a dedicated treatment program that is going to take time and have it's periods of ups and downs and that you really need to put all things off to one side till you start to see success. So, don't feel guilty about anything, don't be upset if you drank more then you wanted and don't try and control it. The last point is important.
You have to actually drink in order for this to work. So if you are feeling guilt and cut back on your drinking then you are doing more harm then good. I know that sounds strange but my understanding of the science behind it is as such. If you force AF days then you are feeding alcohol deprivation syndrome and you may be making it more difficult for you. It's hard, I know, we all have work to do, places to go, people to meet and so on but when you start TSM you are dedicating a minimum of three months out of your entire life to a program that will make you better. So stick to it and keep a positive out look
Remember we are alcoholics and we cannot control our drinking for a variety of reasons. But in order for TSM to work you shouldn't be controlling your drinking. You should take your Naltrexone an hour before your first drink and then proceed to drink as normal. So don't be surprised if you cannot control your intake and don't even try to do so or else you are fighting against TSM.
Okay so finally, if indeed you are drinking to excess on Naltrexone then it's probably best to use the recommended 50mg dose as has been clinically proven to be effective in treating alcoholism. For me and many others a fraction of that dosage works but that's because we have reduced our numbers to a significant lower level. If you are consuming 10 drinks for example in one night then the Naltrexone will block it only up to a point in time that may be shorter then the amount of time alcohol is in your system. So you drink all night on a lower dose of Naltrexone and block the rush but then go to bed and the Naltrexone wears out of your system in the presence of alcohol. I have no idea if that is what causes a Nal-over but in any case it's not good. So a higher recommended dose will prevent that.
Just barking out my thoughts.