Good evening @Former-Member,
I hope you have had some good in your day. I have had a peaceful day - which is super nice. 
Oooh it sounds like we are doing a book exchange. 
The book I would suggest starting with in terms of attachment theory is this one:
Attachment in adulthood: Structure, dynamics, and change. It is by Mario Mikulincer and Phillip Shaver. I have the 2007 edition, but I just checked the book depository and it seems a second edition was published a month ago!!! https://www.bookdepository.com/Attachment-in-Adulthood--Second-Edition/9781462533817
The book has a MASSIVE reference list, so if you start with this one, it will guide you to other relevent literature.
The seminal work on attachment theory was done by John Bowlby and Mary Ainsworth. You will find them heavily referenced by Mikulincer and Shaver. Therefore, I would suggest starting with Mikulincer and Shaver and then if you want to go back to where it all began, go and hunt out the works of Bowlby and Ainsworth.
Be aware that this stuff can make for tricky reading. At least, I found it tricky and it sounds like you and I have similar stories in some ways. It was tricky in terms of the sense of "if only..." if that makes sense. However, I find that I am ok with that feeling because it tends to be mixed with a super big dose of validation and a sense of knowing that my muddle is a normal reaction to a very abnormal situation, rather than that there is anything "wrong" with me.
Have fun! 