I also replay situations that I have seriously messed up somehow. I become quite obsessed with them and "lose my identity while trapped in my head." I tend to change the situation though, mentally, inserting the potentially correct response or words or what have you, until I make it right within myself. In the process, I manage to find out where I went wrong and come to understand that situation and my motivation very well, as I need to change my mindset while replaying in order to be able to say or do different things. I cannot stop obsessing until the situation seems right to me. I find that I need it to run its course in order for me to be able to move on. If I try to stop it, I just become preoccupied anyhow and mess more things up due to my preoccupation. I cannot stand it when I get like that. It drives me nuts because even though I torture myself, I like being caught up in my head. It can be a nasty cycle like that...
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"...don't ask me why it's just the nature of my groove..."