This might sound harsh but your blah is probably due to insufficient (or possibly complete lack of) project planning. Don't be offended because I'm speaking from years of experiencing the same thing.
Project planning is an important step in the whole process. If you don't plan out you project, really put stakes in the ground about it, more often than not your next actions end up being mini-projects but you don't know that until you start trying to do it.
Example. On my sent action list is Call Fred. I go to do it. What's freds number? Don't know. Maybe Sarah knows. Next action, call Sarah. What's sarahs number? It's in my...left it at home. Maybe John knows. Call John. John is at lunch. I'll call him after lunch. Ive had this happen in many forms many times. Insufficient planning make s you numb to your lists.
I guess what I'm saying is that choosing an action to do next is not the same as choosing the next action. And you can't trust your list of next actions if you haven't planned/thought out the project sufficiently. Therefore, numbness.
Hopefully that made sense.