stuck in a loop

so i work nights at the warehouse and man, its always so quiet i start talking to myself just to hear my voice. today, for like 3 hours straight, im stuck replaying this one dumb argument with jake from last week. its not even that important but every time i try to move on my brain goes right back there. feels kinda crazy, is it normal to keep going over the same thing so much? should i talk to hr about a therapist or am i just being silly? help lol.