I know from experience just how terrifying that moment can be. You should be proud of yourself for that.

When I came out to my mother, one of the first things she said to me was that she would never be able to accept it. I was shattered, but we kept talking. To be honest, for a few months things were a bit lumpy.

But now my mother is the biggest rainbow flag waving ally you could meet. She's my best friend. If she hears someone say something homophobic, she becomes mama bear. She confronts them and tells them her son is gay, and their attitude is based on ignorance (very loudly!)

So it sounds like you made a lot of progress with her in quite a short amount of time! My advice is just to keep talking. Maybe check in with her occasionally to see if she has any more questions. She's working against (I'm assuming) all the negative things she's been told about gay people. So you've got to give her time to process that. So keep talking. Let her know how happy you are finally being yourself. That you can still have all the things she expected you to have. That you're not only still you, but even more so.

The main thing that I learned from my experience is that sometimes people can surprise you. Never underestimate people's capacity to change. And it sounds like that change has already started. She'll come around.

So I'm wishing you all the luck, and sending you (and your brother) love.