So I did it
Her reply? "You do not need to ask to come back home. It is your home for as long as you want it and I will support you in any way I can xx" I got this just as I'd gone out to get some milk, so it was a little embarrassing that my eyes were welling up in the middle of the shop.
We haven't spoken properly about what I'm going to do exactly, which is why as far as everyone else is concerned, I'm still applying for postgraduate study. I think I'm going to keep the application in for the moment since it's not impossible I may be able to defer for a year.
I just need to time to gather myself and heal. This is being made so much easier knowing that I've got my mum there for me if and when I need her.