nahh, not really.
i do get parts of songs stuck in my head sometimes though,
but then again, so does everybody from time to time so it's nothing special.
rather than habitually think something endlessly, my brain tends to go into quiet mode & my thinking just goes kind of blank and it's like the only thing my brain registers is sensory input: touch, smell, sound, etc. without the chatter of my brain's commentary on it.
but that only happens if i'm not doing anything really and don't feel the need to think. it feels almost like my intellectual brain shuts off and switches to the primal brain. unsurprisingly, your sense of hearing seems to sharpen when your brain is silent, and when i do that i feel kinda spacey, but oddly more alert at the same time.
but there are also times when i think endlessly too. but not something repeating, but just thinking about EVERYTHING. Like suddenly my life decides to flash before my eyes and i think about all sorts of crazy random things from the past, i also think about the future, the present, philosophy, life, people, events, problems, imaginings, basically just about everything. and not even because i really try or want to. thoughts just wander into my head. and this all usually happens when i'm trying to sleep too which is kind of annoying because then i can't sleep 'cause my brain won't shut up & turn off & then i end up reading books into the early morning til i finally just pass out asleep from the exhaustion of staying up wayyy too late. then end up sleeping in which i hate because then i miss most of the day. but then it throws off my sleep schedule so it happens just about every night because then i've slept most of the day so i'm not tired til way late again. and so it starts a vicious cycle of pseudo-insomnia. even now it's like 30 minutes after midnight. but i'm simply nowhere near tired yet. thankfully i have lots of reading material or i'd go insane with boredom 