Yes, all in all, given the frightening, aggressive, and intimidating context of the relationship you had with this individual, it seems like the psychological atmosphere in which you were taught to use tampons could be severely traumatizing. You see, from what was initially described it could have been a well-meaning, say, mother, who was just trying her best. This, however, is different, and it seems like it went far beyond the tampon-use issue. It's about how much you trusted this person, how safe you felt, the consequences of not "consenting" to something you didn't want to do. In other words, maybe a "no" wasn't even an option for you for multiple reasons, which in itself, negates the fact that you actually consented. All these are important to figure out for yourself - have you considered going into treatment?