Cloudy with a chance of scattered thoughts

For a long time now running has been a way for me to clear my head, get my thoughts in order, meditate on life, etc.  Recently I seem to have lost my center.  I can think of many possible causes.  The weather has become brutally humid, so much so that what used to be a pleasant run around campus is now a far more physically draining swim.  There's also the fact that without a regimented teaching schedule I feel a bit adrift.  Not that I don't have lots and lots of work that requires my attention; it's simply that there is no set schedule for getting it done, no daily routine.  If we add in the rather large life changes facing me (including going up for tenure this fall) we have a plethora of things on which to blame my inability to find my happy place.  Regardless, I feel as though I've suddenly become ADHD.  During my runs I find my mind hops from one topic to another never settling on any one long enough to get through a complete thought, let alone finding resolution.  It's starting to really annoy me.  I suppose I should take solace in the fact that I'm logging the miles and getting my exercise, regardless of what is (or isn't) going through my head.