What do you do about fatigue?

I sleep 7-8 hours every night, take my vitamins and drink caffeine/coffee when needed. But damn, I always seem to get very tired in the late afternoon/early evening everyday. I always want to take a nap but a girl needs to work and stay on my feet most days.

Does anyone have any tips of things that help them with the chronic fatigue aspect of this disease? It’s one of the most bothersome symptoms for me. Thank you in advance.