J, maybe the PTSD is what makes it difficult for you to sleep. Perhaps if you can manage the PTSD, your sleep will improve. The trauma and anxiety of PTSD resides below the surface, but it will jolt you awake many times over when you try to sleep.
I can relate to the feeling of panic from even driving by a hospital. In her book "From Panic to Power" author Lucinda Bassett mentions how she would take a different route to work just to avoid driving by a certain hospital.