As you are having problems I suggest you go back to basics and try a brass pendulum
Pendulums do NOT work for everyone.
Also, if you do not have much control as yet a crystal pendulum is no good for you at this moment in time, perhaps later on when you are more used to them.
The more facets a crystal has and the more bits of crystal and rock added to that crystal, the more energy it picks up from the surrounding area, the more confusing messages become, the less lightly it is to work properly.
Professional dowers use brass pendulums, very basic crystals and/or dowsing rods