What happens when you suppress your emotions , your feelings?

I was feeling horrible sadness and anxiety last night. So many people out there in pain. My friends on the ragged edge of disaster. My self feeling alienated, helpless, and alone.
And suddenly it was like a switch in my head turned off. My emotion chip i guess. And I lost all feeling/emotion. My mind suppressed all thoughts. It felt like a sheet over them in my head. And i went to sleep. Woke up.this morning and still feel under control.