NL I have been following your thread and thinking of you lots. So much of what you describe is so so familiar to me, and you have pnd on top of that.
I thouht dd was a difficult newborn because she cried unless she was held, and had colic so cried every evening for the first 8 weeks. She also slept on me for the first 8 weeks. As I say, I thought she was difficult, then I had ds. He cries. He cries if he is being held, he cries even harder if you dare to put him down. Being held isn't enough for him, he needs you to be standing and moving. I think the only reason I didn't develop pnd was because I already knew from having dd that at some point it would get better.
Motherhood is a huge shock to anyone, and when you have a high needs baby it is even harder-it's nothing you are doing wrong, that's just how your baby is. One day your baby will be that cooing gurgling bundle that you see on tv or in magazines, he just isn't there yet.
People say, it gets better at 6 weeks, or 8, or 12 and I can warn you that as each of those passes you'll briefly feel worse again because you'll have passed that supposed magic week where things are meant to get better. They will have got better, but it won't be a miraculous change, and you won't realise it until you look back later. I'm sorry that isn't a positive thing to say, but for me knowing and expecting it would have been better than getting to those weeks and feeling like shit because everyone elses baby had got better at that point and mine hadn't.
Handling your baby roughly? Normal. Maybe not normal to everyone, but normal if you have lived and experienced a baby that just won't stop crying no matter what you do.
Fighting with your partner? Normal. That's what sleep deprevation and stress does.
Feeling like your life has been turned upside down? Normal, especially if the baby won't stop crying long enough for you to brush your teeth or have a wee let alone shower or eat a meal.
But, it will get better, it really will. I know we are all telling you that, but I also know that right now you don't believe it. Trust us, it will, and you can begin to look forward to that day. It will happen gradually, one day you'll realise that instead of screaming continuously your ds has had several screaming fits, or that it has taken less time and effort to settle him. A few weeks ago I was pacing up and down continuously to try and get ds to be quiet, now apart from one big cry in the evening where nothing works, it only takes 5-10 minutes to settle him-and I can usually put him down once he is calm.
Please keep posting, not only does it seem to be helping you to get it all out, I also think this thread will help others in the future, not least because you are able to articulate your feelings so well.