Hang in there red.
You didn't ask, but tips for a better stereotactic needle biopsy:
Ask for a sedative. And ask for a dosage that's strong enough to do more than keep you from chewing your b00b off to get out of the machine. If you're prone to back pain, it's even more important, since the sedative will act as a muscle relaxer, too. You'll be locked tightly into spinal extension for about two hours.
Bring an mp3 player with some soothing music on it. I can't guarantee they'll let you use it, but they let me, and I was hugely glad of it.
Don't believe what they tell you about pain and recovery. Compared to some of the surgeries they have to do, obviously a needle biopsy is quite minor, and that's the standard they compare it against in their minds; but it's still an invasive procedure on a very sensitive part of your body. Depending on how sensitive you are, expect it to be a day or two before you can wear a bra; maybe 3 days to ride a bike on smooth flat surfaces; a week to ride steep hills or major bumps, or to run; a good two weeks to do anything that requires a lot of reaching or rapid arm movements like aerobic classes. Don't let them send you home without a day or two's dosage of some decent pain pills.
The volume of your breast won't come back, but there won't be such a noticeable divot after a couple of years.
And please have a plan for what you will do if the biopsy comes back anything but clear. Hopefully you made those plans before you agreed to the mammogram ... basically the less emotional pressure you're under when you have to absorb a whole lot of medical literature, the better. Be aware that the results won't necessarily be binary; there are many types of abnormalities considered "pre-cancerous" that you might need to make decisions about.
Good luck - wishing you the best. ((((((red))))))
Speed comes from what you put behind you. - Judi Ketteler