A day of rest.
Feeling a little out of sorts today and didn't run. I'm not sure if I'm just fighting off a bug or if I've just been running too much too fast of late. I had this kind of feeling at the end of my last training cycle when was doing 200K weeks. While I've only been running about half of that mileage recently I've done plenty of speedwork and I have a similar sort of pain in my lower back kidney area and I generally feel like someones put a big syringe in me and sucked out my energy!
Anyway should be fine after a couple of days rest and even feel a little better after spending time in the sauna tonight.
What I know now is I'm not going to run when I'm feeling like this anymore, I learnt this the hard way last time when I almost ended up in hospital! You can ignore most everything I say but I reckon, like Thomas, that recovery is the key to a long and successful running life and I'd advise you to forget about keeping up a "Running Streak" for its own sake. I reckon you don't have to take a break, day off, unless you feel bad but definitely have a down week, with less effort and mileage, once a month, whether you think you need it or not!