Yeah I just started thinking about it, because I was worrying a bunch about this project I had to do, and then when I completed it I felt really good.
Then I realized that if I hadn't made such a big deal about it, it wouldn't have felt that good to finish it. If I had been stoic basically.
Then I thought maybe that's how it works, the amount of mental pain you go through equals the amount of pleasure you feel. That might explain why some couple's relationships are so up and down, like a rollercoaster. Maybe subconsciously they like the drama (pain), because they know it will lead to making up (pleasure).
Just a thought