I generally get derealization. Everything around me seems very flat and 2D. Everything seems to have an invisible bubble around it.
Derealization is a dissociative symptom, and can be a symptom of mental disorders such as "severe sleep disorders, depersonalization disorder, borderline personality disorder, bipolar disorder, schizophrenia, dissociative identity disorder, and anxiety disorders." That's from here:
Derealization - Wikipedia, the free encyclopedia
And yes, it can also be caused by Benzo withdrawal, LastQuestion.
Maybe you're experiencing depersonalization?
Depersonalization - Wikipedia, the free encyclopedia