OMG, yes!!!
I don't have fatigue. Fatigue is staying up too late watching Netflix. I have profound, overwhelming, incapacitating, leaden exhaustion with muscle PAIN (not aches), severe headache, nausea, loss of appetite, chills. Sports drinks with sodium and potassium replacement somehow really helps. I use Propel or Gatorade, sugar-free. The powder is much less expensive than liquid & is by the crystal light and kool-aid powders in the grocery store. LOTS of water/sports drink, like 16 oz every couple hours. I usually just have to go back to bed, even an hour after getting up, in a very dark & quiet room. Hot baths feel good on the muscles.
I have this when I do too much 1-2 days before. Limiting myself to 2-3 hours of brain/thinking/concentration a day and no more than 2 hours physical activity (bathing, cooking, laundry, grocery shop, errands, walking, standing) helps to decrease the frequency, severity and duration of these episodes. When I know I have a 'hard' day coming, I do very little the day before and don't put anything on my calendar the day after.
It is hard to explain to others because I look normal. Look up "The Spoon Theory", it describes this well.