@adanab, I don't know about a "fix" to fatigue, but I can direct you to this related discussion where members share how they deal with fatigue and cancer:
- Fatigue and cancer treatment: How do you cope? https://connect.mayoclinic.org/discussion/fatigue-in-cancer-treatment/

Additionally here is a blog post and a webinar from Mayo's Cancer Education Center that might offer some insight:
- Strategies to combat cancer-related fatigue https://connect.mayoclinic.org/blog/cancer-education-center/newsfeed-post/strategies-to-combat-cancer-related-fatigue/
- Managing Cancer-Related Fatigue Webinar https://connect.mayoclinic.org/blog/cancer-education-center/newsfeed-post/managing-cancer-related-fatigue/