"It was the best of times, it was the worst of times..." - Charles Dickens
Maybe it helps to know that it has always been so. The Darkness in a battle with The Light. Bad Times & Good Times always contending moment to moment.
I'd recommend pulling your horns in a bit. Focus on the small, close to hand things. Do your laundry, sweep the floor, play your guitar, sing a song, listen to cool music (Daft Punk & Steely Dan) on a pair of great audiophile headphones, watch a funny & engaging limited series show on Netflix (Beef). Eat well. Sleep well. Carry yourself with a happy swagger. Attend to business, which is being fully alive with maximum heart and soul. Keep close to laughter. Not the cynical sarcastic kind, instead the true soul-enriching belly-laughs.
Be Happy to be Alive. Despite the darkness and turmoil. That's the ticket. It is a slender reed, but it's everything. Alive. Still kicking. There is Hope & Joy in the simple momentum of Life. Living. Really. I'm not kidding.