I was being used as a research project for a bunch of neurological symptoms, they found I had Epstein Barr Virus in huge amounts, they kept doing spinal taps (in the 80's but I will never do them again) that has left me with the worst migraines than I had before. However, I was told I had Chronic Fatigue which I definitely felt it was hard to do anything that I used to and as a single mom I was sick, no energy and going down fast.
They ended up giving me the "Gamma Globulin Shots weekly", they saved my life literally, they hurt but only about the same as my migraine shots hurt now.
I was given every narcotic available that's not around today, steroids, sent to a hypnotist, acupuncturist, they took nerves out of my feet, so I finally had enough and said I was done doing any of it.
One thing I wish more than anything right now to this day is that I could get those shots again.
If they are available to you, it will boost your immune system (which I was always getting phneumonia and other things) but I had energy. Caffeine will never, ever get me there, I even get "Nuvigil" and it just wakes me up.