This is such a great thread. In addition to alcohol, I weaned off of klonopin recently, so there's a double-whammy for me.
In the beginning, I had incredible fatigue, very little motivation, bouts of irritability, and difficulty concentrating. I noticed that there was a major change after two months: making decisions/logical thinking became easier, drastically improved memory/concentration, and more energy.
That said, it was incredibly hard to sit back and allow the process. At about a month or so along was actually the worst mentally as I became frustrated and, frankly, scared that I'd never "get better."
A trip to my doctor allayed a lot of the fears. Eating well and *regularly* is really important.