I almost posted this without the professor-fucking part but I decided that it is in fact crucial to combating OCD. sometimes you have to fight fire with fire i.e. spiraling thoughts with strong negative emotions get countered with strongly emotive surprise, cringe, and humor
sometimes the OCD brain can't just be stopped from fantasizing completely, but you can redirect that anxious mental energy toward crafting a fictional setup and story that doesn't involve you or your fears at all
another thing I do is interrupt intrusive thoughts with a very conscious and deliberate "and then an elephant walks in." and I'd make myself commit to the bit. it would force me to reframe everything and specifically understand it in an absurdist context, make me confront how ridiculous the initial thoughts even were, and there is honestly no way to keep being serious and distraught about your what-if scenarios when you've introduced a fucking elephant into the mix. film studies professor is also that elephant.
so it goes from scary thoughts about my life -> step back. this is a weird fictional film now. -> characters are analyzing the film -> those characters are super messy and have their own problems, and I'm watching them now and eating popcorn at this soap opera