Welcome, Nicole. I'm a newbie, too.

OK, I am not a doctor and by no means am I wise, but I don't think you are getting enough calories in each day. Particularly if you are doing so much running. What is your body using for fuel? When you don't eat enough calories, you don't consume enough energy to sustain your activities. Your body goes into "survival mode" in which it thinks it is being starved and it starts holding on to every bit of energy you do give it. Might want to look into this a little more.

Good luck with the running. Sounds like you are doing great on that end!

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