Perhaps not directly related to the question but a good idea generally is to vary our ibadah in terms of how 'heavy' it is.
There are sometimes when we are completely focused and it's physically and spiritually draining because we put so much effort in.
Other times we can maybe read a 'lighter' book or a few hadiths around a subject just to pass the time but in a non heedless way.
There's probably some wisdom in varying 'what' we do but also in varying 'how' we do it *especially* in times when we feel overwhelmed.
Our nafs loves to gravitate to extremes in both obedience and deviance such that we become overwhelmed.
We have to learn (sometimes by trial and error) how to maintain a just equilibrium.
Just a few thoughts.....
PS If all else fails download that angry birds app on the iPhone and say bismillah every time you take a shot. You'll be amazed how much dhikr you'll make playing that game!!!