5 weeks of abdominal radiotherapy and chemotherapy tablets side effects and what to expect

Hi 

I am newly diagnosed with bowel cancer and a lymph node that could possibly be cancer .

I have to have 25 sessions of lower abdomen radiotherapy in 2 places and chemotherapy tablets .

Has anyone had this and when do you start noticing the side effects and what did you experience as the treatment went on .

I was wanting to carry on working but have been told I wont to .