In the mid 80s I read an intriguing time travel story, collected in an anthology from the previous 10 years or so.
It concerns a couple who realize that their history is being manipulated by the wife's ex-boyfriend, who wants to prevent their marriage from ever having taken place. Each time he successfully goes back and changes something, there is a characteristic description of a taste of cotton wool in the mouth. There is some delay before their memories catch up with the new reality: one time the couple mutually know their wedding date was in the spring, but also briefly remember it taking place in the summer.
At the end, the husband goes back and does some manipulation of his own, not altogether successfully.