At A Loss Of Words

Writers block can be your biggest downfall.
Sometimes writing is the only way to begin things, end things, confirm things, discover things, the list goes on.
So why is it that, when what you need most is your words and emotions in a complete sentence, your brain comes to a complete stand-still?
Right now, I can't think of anything to describe this, all the questions i have, all the anger, the embarrassement, the "how could i be so blind?".
So how can i possibly successfuly learn what i want to know, and what im told i should know, when my brain can't possibly form a sentence that makes sense

or even the right word for that matter.