I was diagnosed 2and half yrs ago  with bowel cancer had the chemo tabs and radiotherapy for 5wks constant,had the bag on for 3months then reversed. Just recently had another scan where they haver founf my insides of my vagina and rectumn fused, from surgery.

But to your question on tiredness, everyone is differant. Its all the treatment and batterings to your body that make you so tired with no energy. I know the feeling, one minute you are shatterered and need a nap then another day you can feel like yourself again (just). Its hard to trying to make arrangements in your life as you dont know how you are going to be on the day. All i can say its ok, normal to feel tired. Just go with it, the poison inside takes years n years to get out of your system. Do what you can when you can. I know that i wouldnt be here if it wasnt for cancer research so i know do a few hours at my local SRS charity shop and if im bad (still have trouble on the toilet) i phone up to say i wont be in and they r understanding. Little and often in your own pace.Fuel up rest x