I'm Losing all of my MOJO! HELP!

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So I've been training for a half marathon since April. I've been eating healthy/dieting, strength training and running. I'm active almost every day. My half marathon is this Sunday, so finally all of my work will pay off and I'll be done with my race. But in the 2 weeks before my race, I've been dropping off the wagon. I'm losing my motivation. I'm losing motivation to eat healthy, exercise hard daily, etc.
I'm in a rut and I need help to get out but I don't know how. Any suggestions?