Ixodon,

You don't mention in what you posted whether you've seen a doctor. There are so many phrases in your post that sound like depression - "overwhelmed, can't think straight, can't concentrate, mind feels clouded, weighed down, hard to do things you love, feeling empty".

It sounds like you've been having problems for quite a while. Maybe it's time to think about counseling/psychotherapy for sure and maybe antidepressants, too?

It sounds like you're in a tough place.