As above and would like to add Free-writing.
Don't even think of structure just start at the top of the page (using actual pen and paper works really well as opposed to typing) and go for it write down the first thing that pops into your head and don't edit - I guarantee you won't be able to stop the flow and eventually get to the bottom of the problem and even find solutions.
I read a book recently called Accidental Genius which is all about this subject. I've come up with so new products, ideas and operations since doing it. It really taps into your subconscious and clears out the noise.