Do you have any family nearby who can help and support?
Re bank account, go to the bank with two forms of id (utility bill or council tax bill and passport or driving license) an adviser there will sort the rest for you.
If you need help with bills etc ring citazens advice.
It's ok to be tired and rest. Working nights is hard and for the NHS is a super demanding job! Thankyou for what you do. That's not losing your spark, that's you being tired and needing to be supported and understood. The housework can wait, or he could have done abit extra.
Its good he's a good guy and a good dad, hopefully if it's done on good terms he'll help you with any questions you may have of things your not sure of if you haven't done them before.
Most people don't go into a relationship and having a baby expecting to be a single parent a few months or years later, don't worry you not on your own being unsettled by that but just know, although its hard and will take some getting used, you will be ok and so will your little one.
Sometimes staying together when it's not there anymore can be worse as your LO grows up thinking that the disfunction is normal. If you can have an amicable coparenting relationship that can be alot healthier than an unloving or toxic one.
It's OK to be scared, anxious, unsure etc, it's a whole new experience for you. But also being on your own and independent, especially if you've never done it before, can be liberating and freeing. Celebrate each thing you achieve on your own. Create special memories with just you and your daughter. Do things for you, have a long bath and a face mask, have a long sleep while she's at nursery, create a scrapbook of days out together feeding the ducks or going for a walk. Find enjoyment in the little things where you can.
You can be happy, you can be forfilled, you can do this with or without a man in your life.