Hi Miss,
You are not a terrible mother or wife! Just take a deep breath. I am not familiar with UK services, but I found this one by searching around on the internet. It looks like they help single moms in many ways, and it's all free. Here is a link to their Help Line but feel free to browse their site.
gingerbread.org.uk/content/425/HelplineI hope this helps. Hang in there!
-Cat