DCIS diagnosed today

After a rollercoaster few weeks, being recalled from my mammogram, having an ultrasound and biopsy and being told at that appointment to expect a cancer diagnosis. At the results appointment I was told its not cancer, its a grade b3 radial scar but need a vacuum biopsy to confirm but told iys highly unlikely to find cancer. Had results today and its DCIS low / intermediate grade. I asked the stage but he said there isnt one. The dr and nurse were very reasurring and the dr described it as on one side of the scale theres incurable brain cancer but mine is right at opppsite end of scale. He also said that there are large scale studies taking place to try find out the chances of these cancers becoming invasive and some countries dont remove them, just monitor but that they always remove them when they diagnosis them.

I know it could be a lot worse but i am still feel really anxious about it. Especially as they told me at the appointment after the first biopsy that it wasnt cancer, I am worried they have this wrong.

Also its nearly 5cm long but very thin  so i am worried about the length of it.

If anyone had experienced similiar, it would be good to hear. 

Thanks