Hey, unfortunatly, I think this is just something you're gonna have to wait out. I'm sorry

I was in a similar situation a while ago, but it did eventually pass. It can take many months for your parents to adjust to the fact that you're gay and that this isn't a phase. I guess, maybe, just don't bring it up for at least a couple of weeks, and give them some room. I think I know how badly you feel you want to talk about it with them, and my guess is that you want them to aknowledge this big fact in your life. So I would say give 'em some time; they'll talk eventually.
It's not the ideal alternative, but- If you really would like to talk to someone about being gay, are you out to any of your friends, or anyone else at all? Maybe you could talk to them about all this?
Lol, and about your mom asking 'Is he gay?', that'll probably past too. My mom did the exact same thingl every girl I met, she freaked and asked if I liked her, and if we were 'together'. So... yeah, that's just part of the adjustment process. If you feel up to it, you could try to educate your mom, if it bugs you, that is. Like next time she asks, say "Is every new friend you make straight?" Of course, she could just say yes, but you get the point? Show her that you're OK with being friends with straight people, and not just other gays :-] Good luck!