I know these feelings all too well. I'm still dealing with them. My little boy was born at 31 weeks and very ill. Quite a few touch and go moments. The machines were overpowering, after a while you learn what's normal and not normal when it comes to your baby and the machines that help them. I know on instinct if he's nudged a line or knocked his tubes because they'll be small changes in his stats. I was learnt how to adjust my hold and his CPAP mask if the machines or picked up signs his breathing wasn't quite right.
And then added to mix his twin sister was moved to SCBU so I had to divide my time even more then she was realised.
It's a lot to take in and very overwhelming. I felt a stranger to my son because I couldn't hold him for weeks. Touch used to send his stats out of whack. I felt and still feel like flake to my other DC because I was hardly there and now I'm 5 hours away from them. I haven't held my DH in nearly 4 weeks. He feels left out and guilty too. It's stressful on all of us but we make it work because we have to. I skype with them every day.
Have you asked about seeing a Child life worker? We had one and she was amazing, she spent time with DC helping them understand why babies were poorly and why mama kept going away. It really helped. Also, try talking to someone, I was really against it not wanting to talk to a stranger but it did help having someone tell ne that everything I was feeling was normal and talked me through things.
My boy is still a while from coming home after having a pacemaker fitted and dealing with his lung issues but we're helpful.
You're baby is still a little young to know how to suckle so it's natural and normal for her to feel tired and stresses, same goes for you. Give it time and try to relax she can probably sense your anxiousness.
I spend every moment I can with him whether it's kangeroo roo care or just reading him books and telling him about his siblings. I talk up close so we he opens his eyes he sees me and hears my voice and feels my touch. I also have something of mine in his incubator that smells like me and one that smells like DH because I want him to know he has a dada too.
His twin is thriving and a part from her size you would not guess she was a preemie. She is rolling over constantlyn, she can lift her head and is in the process of trying to sit up - no luck yet!
They are almost 17wo (almost 8wo adj). Preemies are strong fighters! :)
All the best to you and your baby :)