What is Trevor's mental illness in GTA 5?

I'm curious to know, what specific mental illness is portrayed in Trevor's character in Grand Theft Auto V? As a gamer and someone who has followed the development of the franchise, I've noticed that Rockstar Games has a history of depicting complex characters with nuanced psychological profiles. Trevor, with his volatile temper and erratic behavior, seems to exhibit symptoms that hint at a deeper psychological struggle. So, I'm wondering, does Trevor suffer from a diagnosed mental illness in the game's narrative, and if so, what is it? I'm eager to understand the motivations and behaviors that drive his actions within the context of the game's world.