I wouldn't race out and reconfigure your diet/regime from something like this, if your fairly happy/comfortable with with what your currently doing. If weird events like this continue over a few weeks then I would start looking at carbs/cals.
The human body can do some unexplainable stuff some times, for example: a few times a year before my weekly competitive football match I get a sudden onset of intense pain in one of my leg joints. I used to have to pull out of the match but five minutes later I get a full recovery and retake my place with no further issues, my team mates are like " WTF dude". Now I can recognise this when it happens and not get to concerned.
I think something like this happened to you, so it may not be dire straights, a word of caution tho, it could be the start of a chronic issue, so monitor carefully.
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