I always wondered if Achilles was struggling with PTSD during The Iliad. He had seen so much fighting and bloodshed that he became depressed and sat in his tent, refusing to budge. Maybe the anger at Paris was just a front.
The first hysterical blindness was documented by Herodotus in the battle of Marathon, "Epizelos the son of Cuphagoras, while fighting in the close combat and proving himself a good man, was deprived of the sight of his eyes, neither having received a blow in any part of his body nor having been hit with a missile, and for the rest of his life from this time he continued to be blind"
He is "cured" from depression when his friend is killed, and he thrown himself back into battle. So it does sound more like sulking than PTSD.
He kinda goes into a blind rage though, which could still fit. Further complicating things — they drink wine relentlessly throughout.