Consequences of an impulsive act

I'm easily the most stupid, self-centred idiot out there.  I'm stuck in the vicious circle again because of the stupid impulsivity of 2 days ago (see 2 posts down).  All I can think about, and all I have thought about all day is cutting.  How selfish is that?  It's stupid, and only a thought, and I'm not even strong enough to ignore it.  AARGGHH I just want to SCREAM.