You may wish to consider that, at age 45 you may simply be experiencing normal pre-menopausal symptoms. This is something you would need to bring up with your gynecologist before considering stopping the Tamoxifen.
Dissolvable staples typically dissolve within 6 to 8 weeks (sometimes longer). If these are still present at six months it is likely they are not the dissolvable kind and your friends mother needs to go back to her physician to get these checked out (it's surprising she did not have a follow up visit at least once or twice after this surgery).
Typically the Oncologist will follow you after the radiation to monitor that this breast cancer does not return.
While it is certainly your choice not to be followed, it would be beneficial for someone in the medical field to do so. Like you, I was diagnosed around the same time (mine was stage 1); underwent a lumpectomy and 33 rounds of radiation. I'm a little tired of the trips to the surgeon (whom I loved as he worked so quickly to get me in to surgery), the radiologist and the oncologist but these amounts of visits will decrease very soon.
I figure one more visit to the surgeon and the radiologist is now rescheduled for February and has himself commented that there will be less and less visits with him so it will likely end up with the Oncologist since I am on Anastrozole but even those visits should space out in number.
I worked through my 33 rounds of radiation (no chemotherapy) but I was lucky that the center was right next to the hospital that I work at. I had my treatments scheduled for 7:30 in the morning Monday through Friday; the staff was great at calling me back; I'd usually be done by 7:40 and at my office before 8 am.
Toward the end I'd have fatigue later in the day which was a bummer but that soon improved once the radiation was over. I was lucky that my job is mainly a desk job.
I also had the oncotype testing done and was happy to hear I had a very low risk rating.