First, congrats on completing your first Olympic distance tri! That's a great accomplishment. I think it's tough for anyone to tell you what could be wrong because only you know your body and how it works. Only you know your running history and how you feel during and after your runs. Have you ever kept a training log? When I was a competitive runner, my coach had me keep a daily log and each week I had to send it to him via e-mail (he was in New Zealand). It didn't just focus on my running performance (mileage, speed, intensity, etc.) but it also focused on my energy level, hours of sleep, diet, etc. Based on my notes, I could usually pinpoint what was wrong with me or my training. However, there are always times when you're going to play the guessing game and you might never figure out what's wrong. So...are you eating well, getting enough sleep, stressed out, etc.? I do think that this heat and humidity that we are experiencing in the DC area may have something to do with how you are feeling. We had a wonderful spring and a great summer up until about 2 weeks ago and then the high heat and humidity hit. Your body probably isn't acclimated yet. I know that runners try to beat the heat by running early in the morning or later in the evening lately it's been really humid ALL day long so there is no break in the weather.
I think you have plenty of time to train for the Army 10 miler and I wouldn't think that doing a metric 3 weeks before will affect your performance. But only you know what you can do! I also think that if you are capable of completing an Olympic distance tri, you are capable of doing the metric and Army! What are your goals for the Army 10? Like I said, I would suggest keeping a log so you can keep track of how you are feeling each day and based on that, you can alter your training plans.
Good luck!



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