Seeing an oncologist can give you a realistic view of the chances of recurrence. You could also talk to him or her about taking tamoxifen as a preventive measure. Also, check into support groups or consider seeing a therapist. It is normal for breasts to be different in size and shape. Though no one knows exactly why, it is common for the right breast to be smaller than the left.
Breast size makes no difference in sexual responsiveness or the ability to nurse a baby.
From puberty on, breasts change every month, growing larger over the course of your menstrual cycle. During the first half of the cycle, ovaries release estrogen, which causes new cells to grow in glands, ducts and other breast tissue, and more blood flows to breasts. During the second half, glands in the breasts are bombarded with progesterone and estrogen and secrete substances that are the precursors to milk. Like the rest of the body, the breasts have arteries, veins and nerves. It is not medically necessary to wear a bra.