Getting drunk is one of the worst things you can do because it makes you unconscious. No matter how adamant you are about staying true to your chosen harm reducing rolling frequency, the best of us tend to make serious mistakes while drunk. Hell, even one drink can lead to another all too quickly. I wouldn't beat myself up for it until it happens a second time. It's only a mistake if you don't learn from it. No matter how much faith in yourself you have before taking that first drink, just know that self control goes out the window with ethanol in the body. Countless times have I taken drugs that I did not plan on taking, solely for the reason that I was drunk and stupid at the time. This is why I hate alcohol now, and I haven't had a drink in a very long time. Alcohol is downright disgusting; not only that, it is one of the biggest threats to the health and well being of mankind. It doesn't sound like you have a problem with Mdma, but rather the very common problem of getting drunk and making bad decisions.