Hard lump in breast

Hi, I'm 42 and couple of weeks ago I've noticed a hard lump in the upper quadrant of my right breast. Went to see a GP and was referred for an urgent appointment on the 18th. My doctor said it's about 2.5x2cm with smooth edges and moves a little but to be honest I really don't think it does...I am petrified that it could be cancer. The lump doesn't hurt which I think is a bad sign. How do you stay positive while waiting for an appointment? I'm a nervous wreck even breaking down in tears at work the other day. Any of you had a hard immovable lump that turned out not to be cancerous?