Content warning y'all

I was vacuuming (I work as a night shift janitor) and some customer started screaming at a girl who I assume was his date or girlfriend ("I don't want to hear it!", "why are you doing this to me!?", that kind of stuff).  It caught me really off guard and I stopped the section I was working on and I started doing some breathing exercises to try to avoid freaking out.  He noticed me there and yelled something at me, so I walked away and went into the back room to calm myself down. By the time I got back either the guy had left or security took care of it.

But it really sent me down a difficult spiral and I'm struggling not to fall into an episode.  Part of me just wants to drink some chemical from the back room to get out of finishing the work day but I know escalating the situation like that would only make everything worse.