baby blues

I'm only 6 days post partum and I know feeling sad & scared of how I'll manage with being a new mum is to be expected around now but I've had my nan here helping me through and she leaves on Sunday so I feel like once she leaves I won't be able to cope without her support, I had quite a traumatic birth which I feel has affected both me and my baby, my partner works long shifts and I feel so alone, even when he is home he mostly sleeps... Can someone please just tell me their experiences with feeling like this and getting through, I just need some encouragement that things will get better because right now I feel hopeless.