Hi Em, 

I went through the same experience and it can feel overwhelming finding a lump and our mind can go into overdrive assuming the worst. 

Best thing for now is to book an appointment with your GP who might refer you for a scan or mammogram) (where sometimes when they can't gage fully what it it, they might take biopsies). 

Meanwhile from my experience what helped while waiting (for all the appointment and the results) was not to think too much about it... or limit the time and have a 'mental worry box' where you put worry till tomorrow and carry on with your normal life.

Also my holy grail was a quick 10 min utube meditation for anxiety, I used to do this every time my thoughts would become overwhelming so try and find one you find comforting and see if it helps. 

Hope you keep well, let us know how it goes 

E x

Thank you both, I know rationally there are other things it can be but my mind always jumps to the worst case scenario with everything so this is just the same. 
 

Thank you both for the advice x