Hello BlueMerleGirl: Well... I presume I'm mostly worn out all of the time now due to old age.

But fatigue is something I've always struggled with. When I was a teenager (many decades ago now) a doctor told my parents I had an "underactive thyroid" I think it was... or maybe it was "over active". Now that I think about it... I'm not sure I recall...

Anyway... he prescribed me some pills of some sort for it. But the pills made me exceedingly groggy. So my parents threw the pills away & that was the end of that.)
I've always struggled with varying degrees of depression plus a boat-load of anxiety.

And I presume that this has had something to do with my high levels of fatigue. The thing is, after a while, all of this stuff does just begin to blend into one another so that after a while it becomes pretty-much impossible to tell what's causing what. At least that's been my experience.