stalking threats

honest to god i swear on my life this happened, i wasn’t able to get a screenshot cuz everything happened so fast, but someone DMd me on here saying they followed me home after the dallas show & called me sexually related slurs. i went to go report the message & screenshot it but i accidentally hit ignore and now i cant recover the chat. i’m really worried and concerned and im kind of sick to my stomach. idk what to do and the only reason im posting this here is cause he said he was at the underscores show & saw my post on reddit or something like that. i don’t post my face on here or even anything identifiable other than when i asked about the outfit i had in mind to wear. 🙁