*Edit: I checked some of the stuff more out in detail. While some concepts on this are valid and backed up by sience, others like RSD are not. Use this as a springboard for learning, not as a valid source in itself. Yes it says so in the corner already. But spelling it out might help.
People are more complicated then a diagram from the internet. Never forget that.
Shot in the dark, not a doctor yadda yadda
Sounds like it could be burnout. (not only workaholics can get one) You can try some mitigation strategies for that and see if they help you.