L.G.
I panicked at age 26 when I felt a lump. And of course I did not go to the doctor. A year later the university sent me to a doctor when I went to student health. It was a hormonal cyst that came and went with my cycle but it was always there. I never worried about it again.
I worked nights at a clinic and talked it over with the doctors who told me it would go away when I went through menopause. It's small but still tender so they were not right. However call the Breast Cancer Site or an organization that specializes in breast cancer support and find out what doctors on The Island know about lumps/pain and breast feeding. Then go see that doctor.