Could be that you are experiencing something like this.

Depersonalization Disorder

As with other disorders in this category, an acute stressor is often the precursor to onset.

Symptoms

This disorder is characterized by feelings of unreality, that your body does not belong to you, or that you are constantly in a dreamlike state.

Dissociative Amnesia

This disorder is typically brought on by a traumatic event.

Symptoms

The primary symptoms are memory gaps related to traumatic or stressful events which are too extreme to be accounted for by normal forgetting.

Reference