You will need to join 2 alignment sticks together or use a cane, but by placing a stick against your head you can monitor any unwanted head movement.
If you tend to lift your arms up instead of rotating your body on the backswing, you can place your golf ball about 1 clubhead width inside the alignment stick that is on the floor. Your goal is to turn your body and arms together so the club goes underneath the angled stick which is at the same angle as the club shaft you are using.