Feeling like the worst day ever & its not even noon

I had an appt with my therapist this morning that I desperately needed after the week I've had. I get in my car and I'm driving to my appt and mind mind has been so preoccupied lately that I rear ended a very nice lady in a mini van. I apologize profusely and give her all of my information. Now I'm panicking even more as I drive away because I'm already five minutes late for my session & after the week I've had I need every single minute. I get to my therapist's office and her receptionist says she had a family emergency and needed to reschedule. She says to me that she called this morning & left me a message but it was from a private number so I did not respond & I deleted the message without even listening to it. Now I'm sitting in my car outside of her office and I think I'm about to cry.