Oh, I see! I really need to learn to read threads in a linear fashion.
Whether the title works depends on the blurb on the book about what it is, and the actual content obviously. So, if you wrote a book about what you do know about BPD and your own experience, then going on to what you/people in general don't know, and interview clinical professionals, other people with BPD, and scientists at the cutting edge to find out (the "what I wish I knew" part), that could potentially be very interesting. People also make documentaries about this sort of thing, some of them end up on the BBC!
But many books that are a labour of love aren't actually that well researched or if they are, they aren't written very interestingly, and even if it's great, it's hard to say if it would be picked up by a publisher or if a self-published version would sell many copies. In any case, these days authors usually have to do a lot of their own publicity whether self-published or not, and that involves engaging with social media, YouTube, podcasters and so on. You don't seem to be keen on that, so it's going to be difficult.
But, try it. Just don't pay a lot of money to a vanity publisher, as they used to be called, to get it published. E-books and audiobooks are the way to go first, if you don't have a traditional publisher.