I had this almost a year ago. I had a core biopsy, then a wire loc, followed immediately by a lumpectomy. It all turned out to be benign, thank God. What I found to be extremely painful was the core biopsy, but, looking back, I know my fears really took over and I became very emotional during it, and now I'm deeply embarrassed.
It hurt so bad, that they numbed me up extremely well for the wire loc., and it was completely fine! I was also so scared from the first procedure, that I elected to have general anesthesia for the lumpectomy. I have absolutely no regrets on that!!
I just want to say, I've been there too, and I tell every woman I know to make sure they are really really numb for these types of procedures!
I hope everything turned out ok.
Dear ktww: Wire localization is by no means painless but your experience sounds worse than usual.