Tired mind/zero motivation!!!

I am 25yrs old and a student. Currently, studying by myself for an exam.
I joined NoFap about two months ago. At first, I was on PMO for about 25 days but then I relapsed. After that my next no-PMO period started from 1st October, which is still in progress, by the grace of the Almighty, and importantly, I don't feel urges like I used to do previously.
However, I have been going through strange mental conditions for the past few days.
I just don't want to do anything. I sit on my laptop to study, but I suddenly switch to social media like insta/facebook/whatsapp. But the point is, when I am on social media, I don't want to use that either, I just scroll for some time and then close it.
Sometimes, I start watching any comedy movie on youtube.
The point is that I just don't want to do anything. Not feeling motivation for anything.
Also, my mind is always busy, like tired, as if I have been working hard for the past many hours.
These conditions at times make me think that I should watch P to relax my mind, but I don't.
Don't know what should I do to get rid of all this trouble.
Any guidance will be highly appreciated.

 

Yes, sports can be very helpful. I need to try that.
Thank you.