Wow, I had a very similar experience this weekend. On Thursday I went to my doctor and asked him about this drug I had read about, Modafinil (provigil). Apparently I had not read enough about it. Anyway, I'd heard it was this wonder chemical that boosted cognition and energy, while not having any of the negative effects of stimulant drugs, mood swings, anxiety, impaired motor function. Basically it was supposed to be a stimulant without any of the side effects.
Let me tell you what it really is, all the side effects without any of the stimulant.
I took it Friday morning and the best way I can describe it is that it made me feel like I had just come down from using a lot of cocaine. I was strung out, depressed, totally impaired cognitive ability, generally uncomfortable with simply being alive. I couldn't even put together the thoughts to have a simple conversation. A friend called me who I hadn't talked to in a long time and I could barely spurt out awkward and idiotic statements, like a robot in the process of breaking down. This conversation only left me feeling even more depressed. I had no interest in anything, not even doing work. The best I could do was to occupy myself with menial tasks to try and keep my mind off of itself. This lasted all day, as in about 18 hours. Being stupid I took it again the next day, and the next, each time in different dosages. I had read so many positive reports on the drug that I thought I must have just been doing something wrong. But no, every day was the same horrible experience. I woke up today with the great feeling that I will never take this drug again.
Ok so how does this relate to alcoholism. Well, stimulants are a huge trigger for me and drinking, and even worse, for opiates. Sometimes even a cup of coffee, usually later in the day, will put me in a I-have-to-drink-immediately mindset. I had many a relapse simply based on this sudden anxiety. This sucks in particular because if I'm going to mess up all the work that went into those days and nights sober, I should at least momentarily enjoy the experience. Instead I end up slamming down drinks just to stop the anxiety. It's makes for a bad night, a worse morning, and worst of all a total setback for all that sober effort.
So anyway, it was a weekend from hell, but I resisted the urge to drink and I am now still two weeks sober, and seven months clean from opiates.