feeling like crap after doing the hpat

I just finished my HPAT and I feel really, really pessimistic about how I did. My percentiles have generally been quite good but I don't feel like I was at my best this time around and the immediate post-exam dread has been hitting me hard. I'm not asking so much for advice on what I could have improved on but rather what I can do to deal with that negativity now- I know perfectly well there's nothing I can do but wait at this point, but it'd be great to hear how people have gotten out of that headspace.