I have some demons inside me

I have some demons inside of me
Not of the religious kind
They express themselves in way
That can be hard to define
Some days they are angry
Some days they are sad
Each time they affect me
Not always in a positive way
Sometimes it makes me tired
Sometimes it winds me up
Some days it mixes it up a bit
And leaves me down, ready to jump
There is nothing to truly explain
Other than just one thing
I have some demons inside of me
And they keep me wanting to scream.