Whenever I find myself in dark moments, I remember this colorful Brazilian proverb:
"Once, there was a little girl who loved to play with her talking pencils. She would spent hours writing stories for them to act out and everyone lived in perfect harmony. All but one: the yellow pencil.
Yellow was always looking for trouble, mocking the other pencils and never following the script. It used to tease her and she often had to stop it from getting out of the case in the middle of the night.
In tears and no longer knowing what to do, she went to the master to seek for advice. Smiling with immense affection, the master asks: Who is the person responsible for writing the script?"
We often allow our thoughts to grow in our minds in such a way that they begin to haunt and control us. We tend to forget that, for a pencil to write a story, it needs a little hand from us (pun intended).
Remember: you are not thoughts. Let them play, but always keep in mind that you are the screenwriter.