Hi - I am 51 too and have had 2 screenings and a recall. I started a thread in Private lives because I was so worried about the second one - the first one was rather painful. Have a look.
Anyway, my second experience was very, very much better. I took some painkillers before I went this time and it was absolutely fine. I got recalled
and, after looking at the original mammograms, I had about 6 x-rays taken on the one side, which was awkward because the place they were looking for was right at the back, next to the chest wall. It didn't hurt and we were able to make sure she got the best shots of the area that she could.
I also had ultrasound, but no one could find anything. Probably two layers of breast tissue over each other on the original mammogram, which is more likely when breast tissue is denser and when you are younger. They were very very thorough and I am pleased they tried so hard, because even I thought the original mammo looked iffy.
I did find a helpful diagram with lots of coloured people to show how many were screened, treated, diagnosed etc, but it has disappeared from the NICE website during their recent upgrade - It was helpful so if I find it, I will post it.