Well, I certainly don't want any dream, and going back 7 years .......you can't have some things and not others.
However.......there IS maybe a way to change some things...........ala Quantam Leap.....where the person was able to "become" some other person, back in time, x amount of years ago, and thus being able to change something. Scott Bakula (as Dr. Sam Beckett) became male, female, all different ages ...and no, he did not use masks. Other actors portrayed the characters........but being Scott knew how something turned out, could make a different choice. I used to love that series. At the end of an episode, back in real time, with the changes in place.