Vacuum

Everytime I have finished something (last Thursday a draft of chapter 3, methodology) I end up in this vacuum: an empty feeling. The last adrenaline dripping away, I start feeling really tired and end up doing nothing. Well, not totally nothing. I'm thinking, but that doesn't show. So it looks like I'm doing nothing and it feels like it too, because I don't have anything to show for it at the end of the day. It is like that at the moment. Would this be what they call 'being in limbo'?