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Holy.
Crap.
What an amazing achievement!
A 48 year old female tri-athlete with 20% bf after losing 100lbs! Wow!
What more can you ask for really?
Well whatever it is, my guess is that you are over trained. Your body is probably wondering what the heck it's trying to get away from. You are exercising for more than an hour a day. Take a couple weeks off. Refuel your muscles (higher carbs). If you are worried about weight then reduce fat a little bit. My guess is you will gain a few pounds but prob muscle that your body has been catabolizing for fuel during your marathon workouts.
Then after 2 weeks get back at it. Readjust your macros back to what they are now and you will be refreshed and have more energy.
You just need a break.
I always assume people know what I am talking about. Big mistake.
Not that I think you should know what I am talking about. Bah! See what I mean haha!