Mama, I'm here to kick you in the ass.
You have been through a tremendous amount in the last few weeks, don't forget that. Give yourself a break on that, and then get going. You CAN do this.
Does the hospital have drop in childcare? The hospital where I had Nolan did, although obviously he was our first so we didn't utilize it. But maybe that is an option. That way when you are there, Aimee can be there at the hospital with you so you can be with baby?
And as far as pumping at home, is there a way to involve Aimee like it's a game. Show her how to pump too, or have some activity that you both can do together while you pump. And you're in England right? I have a Lactina that I bought, but it would probably cost an arm and a leg to ship it to you.
Does the hospital not offer donor milk for preemies?
Lots of mama. I know how hard it is and I didn't even have another child to look after. I know how strong you are though and I know that you can do this.