chronic fatigue syndrome
"I was a very active, energetic, workaholic before getting CFS.
Doing heavy physical labor & paperwork for  30 to 40 hrs at a time was no problem for me. 

Then it hit. I was devastated. I spent $4000  on tests & went to many Doctors. Finally I was diagnosed CFS. 
He was doing a clinical trial on Provigil (modafinil) & the early results were so good he wrote me a Rx for it.

When I restart taking it after not using for awhile (Insurance Company hassles)  I start with a 1/4 tablet (50 mg) for a few days, then 1/2 tab for about a week & 200 mg tablet per day. At times 2 tabs per day give me a slight extra boost. 
With this I get up to 10-20 % of MY previous energy levels. It's a Blessing."