I've come off a few stimulant binges before - the last one 9 months ago really fucked me up for almost half a year, and certainly for the first 4 months, I was a bit of a nervous, anxiety-ridden wreck. I was even paranoid to the point of extreme - details aren't necessary, but yeah, I seriously had full blown delusions about people finding out about my drug history off of no evidence whatsoever. Anyway, I barely smoked weed except for two times in that time span, which was crazy for me, considering that I'd been a constant pothead for up to 4 years prior. I drank a few times right after my last binge happened, because it was winter break and I was hanging with old friends, but that was NOT a good idea. Nothing crazy happened to me, but I had some definite heart palpitations, and the worst hangovers of my life, even though I would have just been drinking a few regular beers. Just to back up what other people are saying, yea, keep off the drugs/alcohol for another 3-4 months, at least. Also avoid cigarettes, if that isn't a given.
If you want my advice, I'd go to the gym and put on some muscle. It's a very easy way to make you feel better mentally and physically and it'll help your body along the recovery process. If you go hard and put on a few pounds of pure muscle over a few months, the improvements in your state of being should be fairly obvious. That's been my experience. Walking and just doing some kind of light exercise in general isn't a bad thing, and it's actually a great start, but it's only a start if you want much more noticeable and immediate results, in my opinion - consciously working day in and day out to build muscle takes regular exercising up several exponential notches - it's like going from smoking dirt schwag to 25% sensimilla. Stimulant binges have to be directly counteracted, so be active and go at it. And also, I know that it should be fairly obvious, but if I were you I'd definitely stay off any type of stimulant for a good, long, while, including caffeine. Don't risk it. Peace.