2WW referral

Hi

i am I driving myself crazy with worry, I had a phone appointment with the doctors on Friday as I have pain in my Collarbone for over 6 weeks, she said she want to see me, so I went to see her the same day, she checked my Collarbone and also carried out a breast Exam, to my shock she said she can feel a lump and has sent me for an urgent referral ! She has said if I don't hear by Tuesday I need to call her so she can chase it up ! 
i have just been diagnosed with mild lupus so to also now be told I have lump and sent me into an emotional spiral ! Also make it's worse I am the same age mY mum was when she found out she had bone cancer 

if anyone could give some advise on what to expect at my appointment that would be greats 

thanks x