Will there be light (слэш)

Setting: unclear. Harry awakens to find himself in a completely unfamiliar life. Suddenly, he is married to Severus Snape, and nothing is as he remembers it. People whose deaths Harry witnessed are suddenly alive again, and none of them have ever even heard of Voldemort! What has happened, and... is there any way to return to his old life, the one he never really wanted in the first place?