He’s mentioned things causing him to go into “depression” but whether he was being treated or not (ie did benzo usage have anything to do with it) I don’t know.
On a completely other hand, I am semi-suspicious of his suicide. He ticked off Putin on many times (including meeting Putin’s main rival who ended up dead 12 hours later), Iran had a hardon against him and Isreal was VERY unhappy with his trips to visit the Palestinians. Those three secret services are well known for their wetwork, so I wouldn’t be surprised at all if that was what happened. Unless there was a suicide note or something like that, I’ll always have some doubt.
Interesting theory