Any advice for coping with a huge financial blunder?

Long story short, after a very exhausting and stressful day, I made some very poor decisions and ended up spending 10k more on a car than I originally set out to, and spent about 7k more than I thought I was spending. It was not a good deal at all.

This has pretty much undone all the work I've done since graduating. I already have financial anxiety in general and I'm struggling to accept this and realize that it's not the end of the world because I'm still here and afloat and okay. Any advice or words of wisdom?