Poisoned
The world in Khan's eyes spun, and his balance grew unstable. He felt on the verge of fainting, but more retches took control of his stomach and made him puke again.
Khan's stomach was basically empty, limiting his retches to mere spitting. His saliva still carried those odd violet shades, but they eventually disappeared, and the same went for the puking urge.
The weight on Khan's chest eased, but the dizziness remained, and his gaze grew unclear. Tunnel vision fell on him, but he could still notice the spreading of the purple marks on his hands. He forced himself to look at his open uniform too, where he saw that his torso was full of similar spots.
The symphony added details, giving Khan a vague idea of his condition. The odd color in his saliva cleared any doubt. His body had rejected the antidote, triggering the opposite effects.