@Flarnflinger I can relate to many aspects of this thread.
I remember my young adult days as the days of trying to find a way through God's police and Damn ed Who res ... or excessive Sanctimoniousness, hedonia and people self harming. So your statements resonate a lot with me.
I too, take diagnoses with a dose of salt, too heavy for physical health, but good enuff for metaphorical meanings. lol. Yes, the whole person is important.
I am going through changes recently due to all the years of different therapies I have tried. I come from CPTSD background.
A few moments in my journey might be relevant.
In a Tai Chi class ... I was asked to find an inner half smile. I found that extremely hard. I had not felt able to smile for decades, but over the years, here and there, I have found it a practice that helped. I was nowhere near being able to laugh or laugh out loud. Maybe a little like Mona Lisa smile ... a little tickle ...
20 years ago I started reflecting on humour and what actually made me laugh. I had a lot of resistance, as I had seen a lot of bullying and unethical laughter, throughout my life, but I also read a lot of literature and appreciated wit and irony ... these days I do laugh quite a lot, and learning spontaneity and to make other laugh a little..
Anyway ... just some thoughts.