I've been through this, admittedly when I was much younger, including lots of time spent at UCLH (back when there was still a building on Mortimer St) and a heavily disrupted schooling/adolescence. I emerged at the other side with a 3+ year hole in my life and a profound sense of social isolation but things sort-of came together eventually. Appreciate that's not at all useful. In many ways the diagnosis is helpful because you have something to pin issues to and work with, but in others it's useless as it doesn't really provide any guidance as to where to go next. I don't really know what the magic bullet was that fixed everything for me, but there was a lot of control of what I was eating towards the end which may have been contributive.