My dd was 4 months old, her arrival had me in tears for days through no apparent reason and at my 16 week check up my hv took one look at me, got the on call doctor into the room and I just burst into tears, told him I couldn't cope, I didn't want to be a parent anymore.
They obv had to go through the whole "do you feel like harming your child/yourself" routine (no, didn't feel like harming dd or myself BUT I felt like leaving her and never coming back).
We had a long talk about everything, lots of crying from me (and anger from me too, most folk who don't suffer dp don't realise irrational unexplained anger is one of the first signs). I was put on sertraline due to bf and after having talked about it all it was a massive weight off my shoulders, I stopped feeling like the worst parent in the world and took the tablets, got better mostly and developed a very close and loving relationship with my daughter.
I will say this, anti d's aren't a cure all. Even on them you'll still feel low at times, they don't miraculously make the problems disappear. They help until you're able to deal with it on your own though and talking is a genuine healer.
If you're feeling depressed please talk to your midwife/health visitor, I promise it won't be as bad as you think, it will only do you a world of good and help you. It always gets better, take it from a fellow fighter ??????