I had this procedure done a few years ago. I was told ahead of time not to eat too much before hand. Not because you will get sick, but because you are lying on your stomach the whole time and you can get uncomfortable if your stomach is full. I was more than likely able to drive myself home, but, like you, I had a ride. The doctor's office told me that while I would be physically able to drive, it is not at all unusual to feel very emotional while all of this is going on, so it's better not to be all alone.
The procedure itself is not at all that bad. YOU will have to lie still, on your stomach, with your breast hanging down through a hole in the table. When I first saw the table I asked "where's the milking stool?". It's pretty impersonal because you aren't able to see anyone, or any of what's going on since you are on your stomach. They gave me a shot of Novocaine, or something like that, to numb the breast. Then the probe (or whatever it is) is put into your breast and cores of tissue are removed to be biopsied. I love weird stuff, so after it was all done, I asked to see the tools and what they removed from me. They hesitated, but I was fine with it. I'll only describe it all to you if you ask and are interested.
I had a large, purple bruise on my breast afterwards, and was most comfortable in a sports bra for a few days (cannot remember).
I was found to have "severe hyperplasia" (or hypo-plasia- I cannot remember). I had to have mammograms every six months for two years. Everything is now alright and Ia m back to the annual mammogram.
It is scary when you are going through this. I hope that it all turns out to be "nothing".
My thoughts are with you. Please fell free to write to me privately if you want to. I am ____@____.com.
N.