Rut.

It's suffocating,
There's no measuring what I can't explain.
It grips my throat,
And strangles my heart
Till it breathes its very last breath.

It drowns my soul till it's at my tongue,
And I feel like I need an extra lung.
Simple tasks of seeing
Bring on something painful.

With eyes open I suffer;
With eyes closed I'm stuck.

What can I say this feeling is?
I'll just call it a rut.