Breast lump - terrified

Hi 

Sorry if this is not the right place to post but I am absolutely petrified. About 6 weeks I noticed a pain in my right breast, it lasted about 2 days and then went away, when the pain was there I did check and could not feel anything unusual. 

2 weeks ago I thought I felt a lump then couldn't feel it again, i have constantly been prodding and poking to the point I have bruised my breast and made it very tender, but now I can feel a lump and I am absolutely petrified I keep waking up in a full blown panic attack, I suffered with health anxiety in the past and in my head it's worse case scenario and I am absolutely terrified I am 29. 

I am booking a GP appt today.