this is kind of weird. I've been disengaged from work and lost interest in it for the past couple of months due to severe Depression &amp; recently am feeling better and getting back into the momentum.
Yesterday i did some work for 3-4h straight and it felt great, but when i felt restless and needed a break, I realised i mightve been running on adrenaline. You know the kind you get when you have a panic attack and you can feel yourself being completely exhausted after, with hands slightly trembling and just being completely drained. 

This happened again today, and I only realise it when i stop work and want to take a break. I then get worried about my body being completely exhausted from possibly treating studying as a reason to activate fight/flight mode so I take a nap and end up sleeping for 3 hours at time (this happened both days). 

Is this something I should be concerned by, because I am concerned my body thinks there is danger every time i decide to study....