I have always had an occasional tender lump in one of my breasts due to a fall years ago and my mobile phone ariel went into it causing scar tissue.  I have been doing alot of lifting lately and the last few weeks I had this tender lump again and tenderness under my arm pit.

I went to see our nurse at the surgery last week who checked me but got the Dr to check.  She said to book an appointment to see her in 6 weeks, but if things got worse to come back in the meantime.  When the Dr felt under my arm pit it didn't feel tender.  However, by the time I got home there was. a message on my phone for me to make a appointment for a mamagram.  Which I'm dreading as I have saggy boobs. Really embarressed.  

My Main worry is if it's cancer - I know I won't be able to cope with that.  Everyone keeps telling me that it is most probably a cyst - but does or can it cause a tenderness in the arm pit?  The lump is in the right breast on the inner side not on the outer side near the arm pit.   Worried to death isn't an understatment.  Do cysts go away on their own?