Elvis lost his twin before he ever got to know him. I have my twin, but we have suffered a permanent rift in our relationship. I am often made to feel ashamed that i am not close to my twin. Just because someone is/was your twin does not make them closer than any friend you could have. Sharing a womb is just geography!
I hate to say it, but i would have rather lost a twin before i knew them, than have to grow up with them, and come to realise that there is no bond there at all.
Losing anyone you really love is a total wrench, but the scale of the loss should not be judged on genetic rarity!