I'm sorry you had such an awful day yesterday

Hopefully, today will be much better.
It is undoubtedly traumatic to see something like you saw on the highway yesterday and I think it's really important for you to tell someone close to you about what you saw. Right now, you're carrying the burden all by yourself, but if you share it with another person it will become lighter on you. Does that make sense? It's just whenever I've had something terrible happen or even heard something upsetting I try to talk with someone else so I'm not "stuck" with it all by myself.
I hope you have a good day, Lawryn!