When do radiotherapy side effects stop?

Less than one minute read time.
Hi, first time on here! Just finished 25 sessions of radiotherapy with 35 chemo xeloda taken orally. Got to all radio sessions on my own and felt quite well. Thought i was really lucky, some people were really poorly. Since i finished 8 days ago I have felt worse every day and am getting dispondant waiting to turn the corner. When do these side effects stop after treatment. I have stage 3 bowel cancer. Need a colostomy in next couple of months.
Anonymous