I
I underwent 6 months of chemo 10 years ago - can't remember the name tho' I do remember it was breast cancer with local spread and some lymph-node involvement. (Needless to say I recovered and regard it as an illness rather than a lifestyle. I help when I can but in between get on with Life)

What I would say is do as much as you can.
BUT -and this is very important- if you get even a little tired stop. Because if your WBC count is less than 3000 they won't give you your chemo. Otherwise you might die on them from the treatment itself - not recommended
So then you have to wait till the WBC is up and in the interim you have got out of the pace of your protocol. Think of it as stopping your antibiotics in the middle and multiply by a seriousness factor of 10!
Take specific advice about this as I might be remembering the numbers wrong. (Quite possible -tho' I remember very clearly the number of tits I used to have!)
Also I dunno what chemo you"re getting but I can tell you the effect is cumulative ie each treatment you start out weaker .After the treatment you feel worse and then get a bit better but not back to the same point
thinking of you