@Spillsy it is quite normal to feel really flat on either day 3 or 5 depending on when chemo treatment you are on.
Be gentle with yourself.... even a walk around the house if you cant get to going outside will help... on my really tired days both my 18 & 25yr old would drag me out of the chair and literally walk me around our 3 Acres to get me moving it did help.
how old are your kids ?
Are you still working ?
Do you have any assistance to get through this from family or friends?
Gentle hugs and energy
Soldier Crab