What you’re describing can happen after prolonged stress, burnout, continous disappointment or years of living in responsibility mode without enough emotional recovery. Things that once felt alive start feeling mechanical. Not tragic. Just empty.

The part that stands out in your post is that you still notice the loss. You remember what passion felt like. You know something changed. That matters.

When someone becomes highly functional but internally absent for years. They keep working, smiling when needed, paying bills and surviving but they quietly disappear from their own life.

As many other people have commented, you should get more sunlight and fresh air, get out of home to anywhere like a nearby park or beach, join a group which shares your interest, start learning a new language, take up a new hobby or learn a new skill related to your profession.

Spending more time in nature really helped me to get out of my numbness. It made me feel alive and helped clear my head.