brake not reverse for a flying machine

built my first flying thing but it tends to spin slowly and i cannot get it to break to stop completely. i have a thruster at the back, 4 thrusters on the side for turning and hoverballs for up and down (which is the only bit that works no problemo). ideally, i would like a way to stop the aircraft completely while being seated in it? is it possible? if not, how to create a brake that does not reverse? and how to stop the whole thing rotating in the air?