Help me please

I can't cope anymore, my baby is only a week old and she cries constantly in the evenings. I haven't had any sleep literally since my 24r hour labour. Weve changed her food, given her intacol and colic drops but I'm seriously considering hiring a night nanny and paying for her on my credit card.

I know it's against everything but has anyone let their babies cry it out for an hour or so? I'm getting to the point where I can't function and am really struggling