Definitely been there. Usually this happens to me when I am not meeting my own needs. That is when I go do something for me like get coffee, go to yoga, lay down and rest, eat something, go for a walk, open the windows, shower, or just anything that will help me feel taken care of.

I can get really stuck in pacing around and not actually accomplishing anything, so I really try to pay attention to where the lack of motivation is really coming from because like I said this usually happens to when I am not meeting my own needs.