aquabluepool I am going to put my amateur physicist hat on here (my son is adopted so I know a tiny but about the care system, as it is today), and say what I think.
That is to say I think you have some serious issues from your past and you need to access specialist counselling. Maybe you have had specialist counselling and worked through all this, but the fact you are on anti depressants still suggests possibly that you have not come to terms with your past, your mother being an alcoholic, her death, your time in care and anything else that has affected you.
Please read up and think about whether you could be helped by counselling. I have heard good things about EMDR Therapy, see 'Why Looking Left-To-Right Repeatedly Could Banish Traumatic Memories'
m.huffpost.com/uk/entry/9397670
Or other Counselling, other psychological therapies in the NHS...
www.nhs.uk/Conditions/Counselling/Pages/Talking-therapies.aspx
Could you even have some form of post traumatic stress disorder?
See Post-traumatic stress disorder (PTSD) - Treatment
www.nhs.uk/Conditions/Post-traumatic-stress-disorder/Pages/Treatment.aspx
All of these experiences you have had are the kind of things that could make pregnancy, childbirth and parenting, a minefield for you, which perhaps you sensed. But which your dh perhaps overrode?
Please do not give up hope. Your past may have affected you massively and may still be spoiling your present but it does not need to be this way. Things may change slowly, with the right help.
It may even be your little one leads you into a new phase of life. Who knows.
You were not in control as a child, but as an adult now, you can be. Please find a doctor willing to listen to your story and advise accordingly.
My advice is do not stop until you get the help you need...or ignore me.
It is your life and I would love you to be free, free to love your child, or your life or whatever, free from your dysfunctional past. 