Feeling flat 6 months in…..

Hello. My first post! Thanks to everyone for sharing their stories - it helps enormously. I am 46 and was diagnosed with BC in January (HER2 positive, lobular with lymph node involvement). Completed 5 months of chemo and three weeks ago I had a double mastectomy and reconstructive surgery. 🙌 Unfortunately the pathology results post surgery showed residual cancer both in the breast (to a lesser extent) and in the 7 lymph nodes the surgeon removed. Ho hum. Based on this my oncologist has recommended me taking KADCYLA, a combined chemo / herceptin infusion. This will commence once radiation finishes in 4 weeks time. This was not in the plan. I thought the chemo was over. Arghhhhh. I have been surprisingly calm throughout the journey so far but this is a definite curve ball. I think hearing words like improving your prognosis has made me feel vulnerable and nervous. Has anyone else been at this point or taken KADCYLA? How do the side affects compare to AC or Paclitaxel? In my mind I was further along the journey than I actually am. Have been feeling a bit deflated at times - a far cry from the positive person I’m known to be.