I hear you. I was getting way too worked up about it as well. I've reduced my phone time as best I can, got some physical activity in, and tried to focus on some hobbies. It has really been helping but it took a couple days to take effect. I'm sure that you have or will be voting. Just do your part and then try to occupy yourself with other things.
I've tried occupying myself this whole time. I actually managed it. Just a sense of dread in the back of my head, no active, debilitating terror. But it's falling apart now that everything's so close. It was easy to kill when the election was far, and I could see it abstractly. But now it's here, and I don't have enough faith in my fellow Americans to be confident. I'm glad Harris's team is, I just hope it means something.