It is tough Lizzie, I am like one of the other poster, no money, no presents, no contact, BUT I am happier and more positive than I was in the relationship, I was married for many years, maybe 2 of those years happily married but the rest was a farce.
So now I am alone, and if i am honest I don't like asking for help, it does get easier, I never thought I could cope with my children alone, I can, it isn't easy so I treat myself when I can, not large treats, maybe a book and a nap, or a cheap bottle from Lidls if Dc ever go to grans. sometimes just silence is lovely.
The first year imo is the most difficult, I don't like the Dc saying 'Oh I cannot wait until your work and we cam buy this and that and this' as it is never going to happen, I try to point out the good things for them.
Try to get yourself out and about more, make friends, look at all the positives in your life and most important take care of yourself.