Newbie! Any other Christians here??
Well Faith, getting panic attacks for fear of vomiting may seem weird, but how about panic attacks from getting panic attacks? (That's how it was for me for a bit) No matter how weird we may think we are, there is always somewhere weirder, or just as weird. And as for your initial 3 questions, I'm Christian as well and I've pondered the same, and this is what I came up with (mind you just opinions, I'm a little blunt so I say what I feel but am VERY open to any other opinion):
1. Fear does feel like a sin, it feels like a lack of trust. Personally this pushes me to let go, trust that the truth will come in time. Go figure, a sin causes stronger faith.
2. Fear is a habit. Ever heard of Pavlov's theory? It's a conditioned response. But just like today becomes tomorrow, new things come whether we accept them or not. Why not accept the one's we want, and thus start a new pattern?
3. I agree, this is the new thing I'm coming to realize and have a great time with!
Nice to meet you too! You already sound like you're well on your way!