Worried sick

Hi there 

I’m new to this site. I found a lump in my right breast and rang my doctor last Thursday morning. I can’t fault them and I was seen as an emergency within an hour. He checked my breasts said he “thinks” the lump is a cyst and has referred me to the breast clinic to be on the safe side. 

I’m absolutely worried sick! They have confirmed that they have my referral and will write to me with my appointment. 

Can someone tell me what happens in the breast clinic please. I know I’m having a mammogram but not sure what else.