You hit the nail on the head at the end of your letter. Revia (naltrexone) can curb the desire to begin or continue drinking. The dangerous thing is the false sense of security, thinking you can drink normally again. You know booze, usage will escalate! The physical effect you are experience could very well be the ReVia, you need to be completely clean when you begin treatment. You have been drinking heavily and it might take more than the usual 72 hour detox to get the booze compleely out of your system. You could need some additional clean time for the Revia to work properly.
You also said that you are an alcoholic "again", I hope that was just a typo because once an alcoholic always an alcoholic. I too am alcoholic and have been "attempting" to be dry for the last 5 years with mostly positive effects. Antabuse didn't work, it just caused headaches and flu symptoms while drinking. ReVia (50MG/Day) is working wonders for me as I don't continually think about the booze, it frees my mind to live a more normal life.
Keep the faith and give the ReVia time to kick in, without using while under treatment.
Al...