Mine was 7yrs ago. Very agressive 2.5cm. I had a single mastectomy, no radiation as there was nothing left there to radiate and the consensis at the time was 15% value in chemo. I went for the chemo to make absolutely sure I never had to go through breast cancer again. So far it has worked.
As to the pain, yes I have phantom oh my gosh that hurt, what was that, pains too. They don't seem to hang around and its fleeting so I figure its either nerve damage or since its the same side as my heart a bit of a twinge. I also have lymphodema since they took all my lymph nodes out of the armpit. Most of the time I can get away with just exercise and manual lymph drain massage but it sometimes backs right up to the tendon in the front of the shoulder which can radiate across the chest. None of my pains are constant though and while some can be acute and invoke a bit of Tourettes language at the time, its all good and goes back to my new normal.