Well if it's affecting your brian . . . I'm the same way I get extreme obsessions (it can be a good thing).

*off topic ego trip: DISCLAIMER stoners are good people and weed affects people differently.

I don't smoke weed anymore because of it, I was obsessed all my actions pretty much centred on weed and playing video games . . . ok I realize I'm on a cannabis forum here go ahead and ban me or something buuuuuut it affected my speech pattern (I was not speaking my native language at the time) I am a naturally timid person always have been but meeting new people became an even more daunting prospect.
Mental illness is in the family (schizophrenia, depression aunt and grandmother) so I quit for 9 months and my obsession is on other things, at the moment I'm into starcraft (lol) and reading weird encyclopaedia eBooks.

ANYWAY what I'm trying to say here is to find something else ! There is a lot of stuff to take your mind of the damn news besides think about it, the news is basically mind control in the wrong hands. If something big happens you will know. Generally I just scan because it's really quite depressing, the world is not going in the right direction, I know that and I don't need the news constantly reminding me.