I can't... contain my strength is Dizzy's first known Instant Kill that appeared in Guilty Gear XX. Before its addition, she originally had no Instant Kill in Guilty Gear X (her Gamma Ray had the same function, however). It was replaced by Emotional Gamma Ray in Guilty Gear Xrd -REVELATOR-.
During the attack, Dizzy turns into a black, demonic winged creature. As the ground begins to shake, energy builds up on Dizzy. Bright light flashes from her and then radiates outward with tremendous force that knocks the enemy down. She returns to normal holding her head due to a headache.
It doesn't use the universal input, and is not listed in her original Guilty Gear XX Λ Core command list.