Something you may not have been told or they just skim over it is that after all the lymph nodes are gone that arm can get lymphodema. Mine was at its worst during chemo and a physiotherapist at the cancer care clinic gave me compression sleeves and a hand gauntlet for it. After chemo it did settle down a lot to what it was and now I seldom need to wear the sleeve any more.
The oncologist I saw a fair bit but it was the oncology introduction nurse who showed me around the treatment area who answered most of the day to day questions.