What is this feeling I have immediately after paying a bill and putting my card away and why does it feel so good?

Every time I pay a bill, I feel this feeling akin to getting off a really good bender (not that I know about that) like something is lifted off my shoulders. I feel great, I feel proud, I feel like I can take on the world. I put my card away, I close the laptop, I take a deep sigh in, I puff my chest out, I stand tall, I walk around for a few minutes. I call my cat over so he can give me some love. I feel good. I feel like an alpha.<br><br>Why is it like this? Why does it feel like this every time I pay a bill?