In reply to Chive Talkin\':
"Derealization can accompany the neurological conditions of epilepsy (particularly temporal lobe epilepsy), migraine, and mild TBI (head injury)[6] There is a similarity between visual hypo-emotionality, a reduced emotional response to viewed objects, and derealization. This suggests a disruption of the process by which perception becomes emotionally coloured. This qualitative change in the experiencing of perception may lead to reports of anything viewed being unreal or detached.[2]
"Some neurophysiological studies have noted disturbances arising from the frontal-temporal cortex, which as noted was highly correlated in temporal-lobe disorders such as epilepsy. This lead to speculation of involvement of more subtle shifts in neural circuitry and inhibitory neuro-chemical pathways."
It all very interesting , I'm not concerned however as I've had it occur a few time throughout life and I'm still here.