Hi Youngdogmum,
Firstly I think if you can take a year off, do so. I went back to work after chemo and took time off every afternoon to have radiotherapy. Fine while I was having treatment but fatigue caught up with me. I worked for 6 years with cancer and although hectic, I loved my job and those who didn't know were non the wiser. My journey different to yours as I was 49 when diagnosed. I had two teenage boys at the time. A very demanding period financially and that in part, played a big role in my decision to stay at work. Nonetheless at that time work did define me which I found difficult to get over once I was "relieved" from my duties. However if I was able to take 1 year off, I would have to look after myself.
So girl if you can do it, go for it.
Karen C