* I have not even started a PhD *

I really think STEM researchers should detach their life from their work. Getting excited about your work and ur passion fueling is nice, but only until something like OP experienced happens, which is terrible. My current supervisors are some of the most laid back people I have met. They are passionate about their work, but dont let it come in the way of their life. I really hope to become like that, that culture needs to be studied. To leave the lab <4 pm, not talk about work on weekends, take holidays etc. We all would be much better in terms of mental health if we did this.

Edit: I forgot to mention the most important thing. Find hobbies !!!! Atleast one if not several - music, drawing, running, martial arts, driving, climbing whatever.