Did you by any chance have genetic testing that could give you an idea of risk of likely recurrence? A post-surgical biopsy yields the information as to whether there were clean, sufficiently-wide margins. If you weren't given a copy, you can ask for it. With a lumpectomy that recent, they can likely still submit the tissue for testing. Mine was submitted by my oncologist and I didn't see him until 8 days after surgery.

I'd probably consider getting a second opinion entirely from a different oncologist.. And, if I needed more surgery, get a second opinion on that too.

As to the post-surgery adjuvant anti-hormone drugs, many people have few side effects and tolerate them. With the caveat that the aromatase inhibitors will effect the rate of bone loss. And you might want to pay special attention to that and have a baseline DEXASCAN before starting them. They might have no negative effect on the spinal fusion.

I wish that more patients with breast cancer were offered the genetic testing. Size, location and stage of tumor are data points. Adding the data derived from an analysis of that unique person's genes is a very valuable data point as well. It helped my oncologist and endocrinologist (and me) feel OK with my decisions re: radiation and drugs.