Well, actually, it can be. I do use humor to cope with my mental illness(es).
But actually experiencing it isn't funny. Without medication and therapy, the intrusive thoughts are pure hell. I spent over a month last summer unable to stop obsessive thoughts of death and dying, nonexistence, and aging, and it was all amplified 1000000xs by dysphoric mania.
I would wake up (when I actually did sleep) and in probably less than a minute my heart was already racing and the thoughts had kicked their way back into my brain. I was in abject terror every moment of every day. I had the worst panic attacks I'd ever had in my life. And despite being terrified of death, I damn near killed myself anyway to make the fucking thoughts shut up. I remember saying repeatedly on every social media account I had that I just wanted my mind to be silent. All I wanted was quiet.
I'd take being obsessed with cleaning over that any day.