Is it mania? I don't know, ever get mixed mania James? Manic energy, head so fast thoughts just become fragments, physical and mental agitation so bad your not sure which way to move, but you have to or you feel like you will explode, but you feel depressed and not euphoric. That's what I feel when I am mixed.. kinda like what you are describing, feel pretty done, but nothing will let me finish.... frantic chaotic energy and thoughts, well maybe pieces of words.

Sometimes when my mania gets bad, I understand where you are coming from.
Thoughts get racing so fast, I feel like I'm losing touch.
I feel like I'm losing my mind.
Sometimes it seems like my life is coming apart at the seams.
It is so hard to try to keep it all together.
So temping to just let it go.
So temping to just let it take over.
I want to hand it the reins and see where it takes me.
But I'm so afraid of where it will go.
I'm not really sure I want to go there.
If I just hand over the controls.
Will I ever get them back?
Or will I forever be lost?