Could I be about to shed again

I’m mid way through taxel and herceptin , after chemo 1 AC. My hair fell out with chemo 1 and hadn’t regrown yet . Toenails have dropped off and now fingernails starting to go . The tiredness of chemo 1 has gone ( as has mouth issues , bloody nose discharge  in am ) but I do have sore muscles in legs and arms but not enough to keep me awake or seek meds for it . Main issue for me is heart issues ( ejection fraction dropped from 64 to 54 % , and hasn’t altered despite being on coversyl  meds - still waiting for cardiologist review ).being reviewed this week re surgery options - was lumpectomy at beginning of this path but I’m wavering   Thinking of mastectomy to get rid of the offending breast and tissue completely . Sorry to hear your symptoms making you feel so unwell . Has your oncologist made any suggestions to help
out ?