I am in contact with Din, a former colleague, through Twitter. He suggested that my dreams about visiting my former employer may be a symptom of Ptsd. Here is what I found in https://forgehealth.com/what-can-cause-ptsd-nightmares/
"Nightmares are a feature of PTSD. Even general nightmares can feel life-threatening, but with PTSD, they are actually tied to an existing trauma that happened in the near or far past."
Facing transit delays or doing an Unpleasant task are unhappy experiences, but they are not traumatic. Is an unpleasant experience a nightmare?