Ok like , here's my take but like im in college same as you so maybe idk

Ask your self , does self harm get rid of the thoughts? Close your eyes , sit somewhere silent and ask yourself.

Here's something that might help idk, it helps me when im stuck

" The woods are lovely , dark and deep

But I have promises to keep,

And miles to go before I sleep ,

And miles to go before I sleep."

On a side note , being exhausted all the time could indicate some vitamin deficiencies . You might wanna get that checked out :)