I need to know how to pick myself up. A 15-year-old boy is relying on me.
Perhaps you can pick up one another. Your nephew found the courage to come out to your family, so something tells me he's strong enough for you to lean on a little. Besides, you're amazing. You're a lifesaver and a hero, as far as I'm concerned, and I'm sure he sees you in the same light. The burden of hate has obviously not broken you, though you may feel it has....between the two of you, I'm sure you can lift it.
Side note to Slog commenters: While VABG's letter, and Dan's response, brought me tears, it's really been the incredible outpouring of love, support, empathy, sympathy, and general encouragement that has turned on my waterworks. You give me hope.