You are definitely right in your skepticism about the possibility of the unification of many micro-consciousnesses into macro-consciousness. However, it is surprising for me that overhelming majority of philosophers ignore the possibility that human consciousness is among these micro-consciousnesses. In my paper http://philpapers.org/rec/ARGNCO I argue that even a single electron might contain the whole current human experience (without long- and mid-term memory). I suggest a hypothesis, where such electrons might be located in a real brain