Hi @heathfield and welcome!
My diagnosis and treatment was almost identical to yours, I was diagnosed in July 2019. So much good advice from the girls here.
If you are really worried, maybe asking for an MRI is the go. Is your doctor worried? Maybe be guided by him/her, that is if you trust him.
It IS hard to keep going to chemo, every primal cell in my body was telling me to run away, but my good angels were telling me to throw the book at that cancer bastard. Just break it down into one day at a time or one hour if by the day is too hard...
My chemo killed most of my cancer cells in my boob and all in my lymph nodes. So as an insurance I had a course of oral chemo for six months after my mastectomy as an insurance , despite having everything chopped out. It’s nowhere as tough as I.V.chemo.
I finished that a couple of months ago and it’s funny but I can barely remember having the first chemo at all even though it was such a roller coaster at the time.
hang in there lovely
Caz xx