@Lwrenn I'm sorry to hear about your post-natal depression, it can be brutal. Take care of yourself and your family, and know that you've got support on here if and when you need it. I've found the parenting resources on Mumsnet really helpful for making me feel less alone.
Knowing people care really does help. Don't stress about money or donations - the best thing you can do is share some kindness and awareness into the world while getting yourself well. There's a lot of darkness going on in the world, and the best way to counter that is with our own efforts at creating positivity and hope, and that starts at home, with ourselves and our own families.