before you leap

I wrote a scathing (and by scathing, I mean a merciless personal attack) evaluation of my University of St Thomas professor. While I was writing it, it was like a high.
But now I feel like a bad Meg Ryan movie. Specifically, I feel like Meg Ryan in "You Got Mail" -- that scene where she tells off Tom Hanks in the most biting way possible, and she gets to revel in it for exactly 2 minutes. And then, she realizes that while everything she said was true, it was also cruel.
As was everything I said. So, tomorrow, I'm calling the university and asking, Please. May I rewrite my evaluation? Please, don't let her read my evaluation. I do not withdraw my assessment of her, but I'd like to withdraw a small measure of the venom.