What Would someone with PTSD from a bank robbery (hes a bank teller) Do that he always does?

Im trying to write a story, and the bank teller needs to do someting that someone with PTSD would do..Example...won't touch his door nob or something. I dont know really.
Please help me out,
thank you

I think an individual with post traumatic stress disorder would be more apt to have nightmares, flashbacks, and avoid reminders of the initial trauma and react strongly when exposed to those reminders. The person might startle easily and also suffer from depression. Also if the character became PTSD because of a bank robbery it might be important (for accuracy) to have had that experience some time ago. If a person has a traumatic experience and begins exhibiting symptoms within the first month of trauma it is actually considerd Acute Stress Disorder.
Behavior such as avoiding a door knob would be more of something one would expect from someone with Obsessive Compulsive Disorder (OCD), not PTSD. Perhaps the person would avoid banks, avoids money so never carries cash, or something along those lines.

Uh, flashbacks, avoid situation again, nightmares and so on