Lithium isn't an anti psychotic, it's a mood stabilizer. Two different ball games there.The anti psychotics he may be on (let's say the pool lifeguard story is true, prompted a psychiatry intervention) a number of the anti psychotics yield a very similar lethargy and dopiness. Not to mention the figure, that's a very frequent sur effect of lithium.
As for armchair psychology hour, Yaniv seems to be driven by attention and not just good attention. Because of that, idk if he's that narcissistic as negative attention usually sends them into a rate because they're not seen as the best thing since sliced bread. The only time Yaniv has raged out in response to something really publicly was the farms visit the other day, and that looked like it was fueled by alcohol or drugs or something.
So yeah idk what kind of fucked up Yaniv is, but at least it's good entertainment
In comparison, look at Onision. He's been chimping out like crazy lately because someone said he had a little tubby beer belly. All his responses have been trying to get his fans to tell him other wise (Guys am I fat? New video: I can't do this anymore... Someone said I was fat and it hurt my feelings).