I worked an intense amount of hours at a stressful company for about two years before I developed a blister on my retina due to the levels of cortisol in my blood (https://en.wikipedia.org/wiki/Central_serous_retinopathy). My vision has been permanently damaged due to it. I thought I could power through and "sleep when I'm dead".
I have exactly same experience. The company and people were not too stressful, but the project and the situation was. It was my first job after graduating, and I was doing most SW alone in a project that, in hindsight, could never quite work due to some technological restraints.
I tried hard to make it work and was stressed often. Not worth... I blame myself mostly for being obsessed about the project, but I wish I would not have been working alone, especially as a newcomer to the field.
Don't do it folks, it's not worth it.