Family and relationships. . I answer a lot of peoples questions?

And try my best to help everyone. But this time, it has turned the other way, As of a few days ago I was told by my Father ( dad ), that he is not my dad, After 46 years it has come as a shattering knowledge, and feels like I have lost my heart. In my heart he is my Dad and always will be, but at times I wonder, what do I do with this, Is it all a bad dream.. All my childhood memories, all my teenage years shattered, and now my Adult life feels shattered as well. Can anyone help me with this, what do I do with this, how do I make life back happier how I use to feel, I know it will take time, but I feel I Need To Do Something..........

thankyou so kindly for reading my question.