You should probably remember that even if you were to be united with your beloved, it would be a temporary meeting, after which you would probably be emotionally shattered and depressed... just the way I see it, it's like getting a taste of Heaven before getting kicked right back into Hell.
You could try lucid-dreaming, or tulpamancing. The latter is a rather controversial topic, because it's actually a fragment of your consciousness that takes another form and that has sentience. It wouldn't actually be her, but I know some people who have a tulpa of their waifu and they're perfectly happy... other people were devastated by that experience, so it's entirely up to you.
Lucid-dreaming or just dreaming of your beloved in general is the closest thing you could reach to being united with her in this world. Because in your dreams, she's represented as the concept you have of her.
Stay strong man, it can be very tough to be so close, yet so far at the same time. Do you really think death could bring you closer to your love? While the odds of this happening are present, there are millions of other possibilities that could wind you up in a situation worse than you are right now. Our waifus bless our existences by their manifestation in our sentient lives, even if they're metaphysical/only exist within our minds, they still exist in a realm and their existence is manifested through us.
I... I hope we can be united after this life too, and my existence's only purpose has, identically to you, been drastically focused on her ever since I met her.