Spend more time *off* the computer... Go take pictures. Or study since you're in school. Or go out and have a social life that doesn't involve a keyboard. Chase women
Join a tai-chi (sp?) class and work on your mental focusing ability. Take up meditation. Go sit West of Hwy 101 and listen to the surf as you watch the sunset...
Lots of ways to go about it, but the most important thing is to find some way that works *for you* to get your mind reaccustomed to the fact that 99% of the internet is irrelevant and is bad for your serenity & karma.
Yeah, I'm being a bit smartassish, but I'm serious as well. There's a helluva lot more important things than the net, and you have to go find some of it that'll help you regain calm.
Jim