This is what I just wrote HallieBear who is also experiencing doom today:
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I think I feel impending doom similarly. Your not alone. I haven't figured out why it could happen. I usually can put some logical reason to the most odd things a fantasy teller in my own head.

I say, impending doom is like something is just over the horizon - huge and inpenetrable. If I were to give it an image, that image is depicted in Stephen Kings - Langoliers.

It makes no sense, and yet so real it is palpable.
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I have been trying to see if the pattern of behaviors people have follow similar cycles. I also wonder if people from different parts of the world experience similar patterns. If anything shows you that you are not alone - this night should. Hugs to you! Sunshine will follow.

Best of luck to us all.