Actually Zeni doesn't have it so bad. He doesn't have a legitimate mental health problem. Alcohol. Solitude. Poor choice in video games. Free play station 4.
Being Zeni isn't the worst thing that can happen.
Sniffing heroin is the best synthetic feeling I've ever encountered. Also bipolar hypomania while listening to music and sniffing heroin is pretty awesome.
For natural feelings... movie/video games. Pleasuring waifu.