Didn't want to read and run as I have had PND but right after birth, but big HUGS to you. I have heard that what you are experiencing is very common, so it might be a good idea to speak to a friend if you can as it really can help.
It is a horrible isolating feeling, and you wonder if you will ever be the you that you once were and were happy with. I was crying every day and because I couldn't bond with my baby I wanted to just up and leave everyone and everything behind and start my life somewhere else. Or end it completely.
I only ended up talking to one friend about how I was really feeling as she had depression before (not PND) and could relate on some level so it was helpful just saying the words to get them off my chest. I didnt want to tell my maternal child health nurse because I was terrified she would report it or something even though I look after my little baby impeccably, and would never hurt her.
it has taken me almost 3 months now to feel better again. Something which has helped me a lot was I would leave Soph with my inlaws (only around the corner) for a few hours once or twice a week just so I could be on my own. I would use the time to do housework or go to the shops for a look around, or sit on my backside to watch a show i liked just so I could feel like my normal self. It gave me a piece of myself back again as well as a chance to clear my head and miss my baby, I don't know if you are near enough to available family but that REALLY helped out.
Please don't do nothing though, this feeling will be like someone sitting on your chest trying to squeeze the life out of you. Best of luck to feeling better soon xox