My Happy is Broke

I really love autumn in Minnesota, so why doesn't my body?? I've been sleeping 7-8 hours per night during the week & 10 on weekends. I've been pumping my bloodstream with 15K ui of Vitamin D per week and taking multis on top of that. I've cut back on caffeine. I have been keeping my work hours under 50. I get outside & do physical activity on the weekends. I bought a fancy new phone. I wear comfortable shoes. SO WHY DO I FEEL LIKE HAVING A TEMPER TANTRUM?!