I am 26 years old and about 4 years ago I found a large lump in my left breast. I had a mammo and ultrasound and biopsy it turned out to be nothing. I have fibrocystic tissue in both breasts. I was told that I needed annual mammos. Recently I found a lump in my right breast. I have never felt it before so I went to the Dr. I am not real concerned about this however they went ahead and scheduled me for another mammo and ultrasound. What does have me concerned though is I have developed a very tender spot and lump under my right arm very recently. I have had many health problems and always expect the worst. Should I be concerned about this or am I overreacting?? Please help!