I do think he has stress, but it's self-induced. He's clearly mentally unwell. Honestly, makes me think of that BoJack Horseman episode where you hear his inner monologue throughout the show and it's just things comments directed at himself like, "you piece of shit.", "You're so fat", etc.
Not an excuse at all for his actions, but I do really think that's what's going on. He hates himself. Needs constant validation. But no amount of validation is going to soothe his inner monologue. So he's spiraling while his stress continues to grow.
100%