Carmen, I hope this doesn't sound like I am belittling your feelings, but I just want to point out that your baby is less than a month old! That in itself is really tough going what with the new patterns and routines for you, your hormones still being all over the place, and your having to adjust and get to know this new little person. Give yourself a chance, babe!
It must be very hard to have your DD walk away while you are trying to give her some attention - I so understand how that would break your heart. But she WILL adjust - she is still very young and she is also very resiliant. While she may not be the same person she was, she will settle back down again and find her groove.
Re the sleeping, that's hard for you, but TBH I am sort of expecting the same thing from my toddler as well. When there is disruption in life, I have found DD's sleeping suffers. When she was 18mo we started her at childcare and she became very difficult to settle and I needed to attend to her each night, patting her bottom for sometimes close to an hour while she settled back down to sleep. It was very frustrating for me (and I didn't have a newborn as well!) but she did get into a better sleeping pattern and now she is a great sleeper, even though she can be reluctant to go to bed some nights. I think it's normal for kids to need additional reassurance at night time when there is any sort of disruption in their lives.
As I said, I really don't want to give the impression that I'm telling you you shouldn't feel like you do. I just wanted to remind you that it is still very early days and I am sure things will get better for you very soon.