The arrow is the symbol of the force which goes to its aim.
The experience you had of something going out from the head like an arrow probably indicates something going out of the mental consciousness towards some aim or object. Sometimes it is a part of the mind-consciousness itself that goes like that either upward to a higher plane or somewhere in the world around, and afterwards returns. Sometimes it is a thought-force or a will-force. Forces are always going out from us without our knowing it even, and often they have some effect there. If we think of a person or a place and things happening there, something can go out like that to that person or place. If we have a will or strong mental desire that something should happen, a will-force may go out and try to make that happen. But also forces can go out from the inner mind without any conscious cause on the surface.