In the comments, megpie71 linked to her extremely helpful post: How to Get Through This: Tips From a Lifelong Depressive. It shares coping strategies that mentally healthy people may not have needed until now.
Acknowledge what you’re feeling is genuine. Don’t tell yourself you’re “over-reacting” or “being over-dramatic” or “being silly”. Especially, don’t try to tell yourself that you’re “fine” (unless you actually mean, “freaked out, insecure, neurotic and emotional” when you say that). What you’re feeling is what you’re genuinely feeling, and it’s something which deserves to be acknowledged. Don’t try to make yourself feel happier or better. Just accept you’re feeling bad, and you’re allowed to feel bad.
I particularly like this part, because those of us who are devastated and terrified by Trump’s win are under a lot of pressure to “get over it” and pretend everything is normal. Everything is not normal.