I get real low in the winter. Last year was the worst. I couldnt even bring myself to get up to go hunting (my#1 passion in life) and lost interest in sex (something that never happens) and my gf in general.
My best advice is to talk to someone and hopefully they care enough to do their best to elevate your mood. Just keep in mind that with every morning comes a new day and do your best to power through it and make it better than the last