Feeling empty after win

I’m having the strangest experience. I have been working on seeing “negative circumstances” as happening for me instead of against me. And it paid off! It finally happened organically where my mind went there automatically without having to do a manual override. I was elated with the results and so proud of myself. But then I found that I was left with this strange feeling of emptiness. I felt like I was missing out a little bit by not indulging in the negative thinking. I’m just curious about what mechanism is at work that has left me thinking thoughts that made me feel empty even though I am truly happy with the outcome. Any thoughts?