I will sometimes, although very rarely, get this feeling after I sleep at night, but I get it every time after napping. I get an extreme headache, it feels like all the blood and pressure in my body has gone to my head and is continuing to try to push up, and I get very light-headed and dizzy, mainly when I stand, but sometimes while sitting too. It has gotten to last longer and longer each time... I used to wait it out and then have a dull headache for the day, but now I have to take ibuprofen because it lasts too long. Other symptoms I've been having include:
fatigue
depression
anxiety
daily headaches otherwise
hair loss
dry skin/lips
palpitations (they come on randomly, not when I'm stressed or anxious)
poor memory, brain lag, brain fog, confusion, etc.
ice cold extremities
acne
decreased libido
diarrhea
heat intolerence
frequent urinary tract infections
decreased appetite
small-moderate weight gain
Although we only did the TSH test, my doctor ruled out thyroid (lab result was 1.5). He wasn't very interested in any adrenal cause. I feel like anxiety could explain most of this, but not all... especially not the horrible feeling after napping. Plus, I'm a firm believer that things like anxiety and depression are caused by something, either real life events that bring you down (which isn't the issue) or a medical condition.
So I don't know. Does it sound like anything to you? My doctor is scheduling a CT scan, but I like to get ahead of the game.

I love medical science.