If your ill spouse/family member has fatgue all the time try talking to their specialist about what else can be done. My husband has Stage 4 terminal metastized cancer (almost 6 years ago had 2/3 of lung removed, and a year and a half ago spread to lining outside the lung). He has chemo every 3 weeks indefinitely (no cure) and had continual fatgue to the point he was laying down most of the day with no energy what so ever.
The Oncologist suggested Gensing which he had a bad reaction to (made him feel sick). So two months ago he prescribed Retalin (one in the morning), and his fatigue/tiredness is much better. He still gets knocked out for a week after the chemo, but the other two weeks he's not living in bed all the time. It does help some.