I've been writing "log of good things that happened today" for the last 2 years (every alternate day on average). It has resulted in a lot of improvement in my perspective and in general I'm more positive in my outlook. But one thing which I've started noticing more and more is my cognitive distortion of disqualifying the positive.
Basically, whenever something good happens I immediately come up with something negative about it and negate it as if it doesn't matter. And I'm stuck in this pretty bad. I can keep on reassuring myself endlessly about the good event but immediately another negative thought comes up negating it. Again I find something good in that event and again a negative thought comes up. If I counter that negative thought then yet another one comes up negating the experience.
Is a clinical term for this behavior? Also, is there any known method for overcoming this kind of distortion?