Yes, I understand the brain chemicals during challenged times. I recently did an intense software project with a difficult customer and a hard deadline. I was working on it 13 or so hours a day, 7 days a week for a month or so.

Even though the stress was there, I was actually quite content while working through some challenging engineering problems.

Working in the shop is different for me. I personally benefit from my own work rather than building a system that I will never see again. I can't at all explain why I do it.

Good luck,