On the sleep thing, winding really really well, and then swaddling worked with ds. We also propped up the head end of his basket, so he wasn't completely flat when he slept. And we used a white noise machine.
With dd, we used the white noise and the propping up but she hated being swaddled. I had the basket right against the bed and when she stirred i could put my hand on her and gently pat her back to sleep.
One thing I did with both was when they started to stir, rather than grab them immediately, I gave them 30 seconds to a minute to see if they were really waking up. Sometimes they were, sometimes they just wriggled a bit and then drifted back off of their own accord.
The first few weeks with ds were hell, I was exhausted, in pain, had no clue what I was doing, and if someone had come and said to me, there's been a mistake, you're not supposed to have that baby, I would have probably handed him back with few regrets. But it did get better. At about 6 weeks he smiled at me. And it all got much better from there.
Even so, I still struggled with pnd with both babies, and I had to get help from the doctor at about 3 months. It made a big difference and I wish I'd done it sooner. Don't be afraid to ask for help if you need it. And if you can, talk to your partner. If you can't then have a think whether that might be contributing to how you feel, and think about whether you need to perhaps go stay with family where you might be better supported.