You will get it back, I am also a vomit writer, it drives my wife(proofreader) crazy. She always tells me that I need to slow down and keep my grammar mistakes in check so that I can follow my thoughts.
I go through spurts where I can develop characters and plot lines in one sitting, shoot I have a whole short story completed in my head, but when I go to put on the page. The blank white page just eats my thoughts, its like the blankness wins out over my thoughts.

The only way I have found to combat this is to jack myself up on caffeine and hope. That doesnt always work. I hope you find your passion again.