so sad

Rose
I had a very traumatic Miscarriage at 12wks on the 7th October. 
On the 6th I had awful backache but thought nothing of it. 
I woke up on Friday to red mucus. I phone my gp he referred me to early pregnancy clinic but they could offer me an appointment until the following day! 
As the day went on I had light bleeding. 
That evening I was sat with my partner and we heard a loud pop, followed by my waters breaking. Complete devastation ! As from my waters breaking I went on to labour, I gave birth to a small baby about the size of my thumb. Well I'm pretty sure that was what it was.  I then went on to loose so much blood I was rushed to hospital. The following day I passed my placenta.
I have found this whole thing completely sad. So so sad. I have 3 beautiful children. This was number 4. We named her Evie as we sensed she was a girl from the start. 
I have found it so hard to move on, I gave birth to a baby which I didn't actually see or hold but my bond was just as strong as it was with my other children. 
How do I deal with this greave ?