it could be your brain going into self preservation mode, warning you of something you do not know .

when i was 7 i was introduced for the first time to a guy my mom had been seing, he was introduced to us by 'this is xxxxxx, he makes me happy and i want to know if you want him to be your new daddy' my brother and i had to 'go upstairs and think about it' half way upstairs my brain did just as you explained, it stopped, went totally blank for a few seconds, when i came to i carried on upstairs, in tears, totally paniking because for some reason there was no way i wanted this guy as my daddy. i was over ruled and only after they were married did i know why i did not want it so badly...he abused me for the next 10 years! i had no way of knowing this before, but some how my brain knew it was wrong to agree to mum marrying him.