Dealing with COVID Paranoia and Pseudomedicines

Gonna start with the question, vent/backstory below. How do you stop yourselves from being paranoid about getting sick? //sickness, paranoia, pseudomedicines for the pandemic My friend's mom has COVID and her dad is going to make them all take ivermectin. She wants to come over so she doesn't have to take it, but I live with my family and my mom is hesitant and the idea of getting sick again or my friend getting sick is triggering my paranoia to a point I don't want to leave my room until I know it's safe. My friend isn't vaccinated either cuz her dad doesn't believe in them. It might just be intrusive thoughts, but I feel like we're going to lose her because of this and no matter how many times I knock on wood the feeling won't go away. The friend is one of my two fps, which makes the idea of losing her feel worse.