Hi Blue2989, welcome to PC.

Well, experiencing a muscle spasm can take place without having PTSD. Also, a person can experience anxiety or panic and not have PTSD or a trauma. While many say they remember their earlier childhood, typically they only remember small portions here and there and most of those years the day to day stuff is not remembered.

It could be that whatever you were watching was upsetting somehow and your mind/body was stressed by it and you experienced a bout of anxiety. Also, it is not unusual for a person to just "zone out" or even "day dream" and then suddenly become aware they are not paying attention.

I don't want to encourage you into thinking something bad happened to you and stress about it somehow.

How old are you?