Training Performance, Severe Changes

OK, so I just don't get it.

Here over the last several weeks I have been plodding along, forcing myself to run with a lot of knee discomfort and very little enthusiasm. I mean, my ITB has really been giving me problems and that has slowed my pace down significantly.  I even had to walk part way one day last week on a short, 3.5 mile run. Then, inexplicably it all changed and I'm back (practically) to my old self again.  But what can be causing these rather severe performance fluctuations? I just don't get it!

Has this happened to anyone else?  Sometimes it's a course difference of up to 1:30"! That's pretty significant!  And why would my knee pain be so intermittent?

AUAUAGH!  It's driving me crazy?  Is it possible that it's related to my stress levels?

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