It sounds fairly normal behavior for a newborn. I wouldn't be doing formula top ups at the moment because you are building your supply. The best thing you can do is feed your baby when she wants to.
If you are feeling really overwhelmed I suggest putting bubs in the pram and going for a walk, or having a bath together and feeding in the bath.
I also second the baby carrier suggestion. Mine has been a lifesaver so far. If he isn't ready to sleep he just comes around with me while I do what I need to and eventually he falls asleep.
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