'creates a tornado of restlessness' The word 'tornado' here means

A tornado is literally a violent rotating column of air — a type of storm. In the metaphorical context of the passage, 'tornado of restlessness' refers to a whirling, violent disturbance in the mind, akin to a storm. 'Storm' best preserves the meaning of intense, violent, swirling disturbance. The passage also uses 'whirls' which reinforces the storm imagery. 'Confusion' is a possible loose interpretation but 'storm' is the most direct meaning.