I appear to be frozen with my work. I'm halfway through my book or more and I still can't deliver a goddamn chapter I don't know why I need help it's like I don't want to finish because it means death in my head and that's so stupid but it's real and I want to do my work. Help.

I wrote professionally for a couple decades. I often experienced an inflection point in my effort, between "I don't know how to start this" and "I don't know how to stop writing, so many ideas spring to mind". Hope it's the same for you.