Earlier quoted context omitted.
It is far from certain that he committed suicide: https://www.bbc.com/news/science-environment-18561092 IIRC part of the coroner's reasoning is that "In a man of his type, one never knows what his mental processes are going to do next." So essentially they concluded it was suicide because something about Turing (gay? academic? gay academic?) was regarded as indicating instability. I very much doubt a coroner today wo…
Bear in mind he was given hormones. As I'm from that half of the population who experiences hormone fluctuations but it's part of what women expect so we know about this and plan for it and support each other, I'd not be surprised if he was unaware of how his emotional state might be affected. Having said that, I'd like to see research on emotional states in male to female transitions, we should have plenty of data?
According to subreddits that the MtFs use, it's mostly sexual arousal. "Euphoria boners" and suchlike.