Dear Stranger

This is my understanding to your question:

Tension: Sensation of the mind and/or body stimulated by external impressions

Anxiety: State of the mind due to internal disposition.This state is a response to a dilusion of the mind.There is no real external stress factor.

Frustration: Injury of the ambitous ego. The "I" doesn't shine. This process is reversibel by applying some ego polish,eg success.

Depression: High order suffering of the mind. The ego is rotting and dissolving within the patient. This is not the selfless state of the higher spiritual path. There is no need for external stimulation. This is an inborne state.