Chemo dilemma

My biopsy doc did a biopsy of the tumor but under ultrasound he said he wouldn't bother doing the sentinel node as in his opinion it didn't look involved. A fortnight later they did a mastectomy and found the sentinel node was also positive for cancer cells. A fortnight after that they took all of the lymph nodes but none were positive. I had to undergo 4 lots of chemo and had a reaction on the second dose. Oncology seemed to be of the opinion they didn't really care what side effects I got after each dose, just as long as I didn't die during the infusion and turned up for each dose. I to this day think that positive node might have been misdiagnosed in pathology and even if it had cancer cells they had already gotten it all on the first surgery. I am now hypersensitive to any drugs at all.