R.J.
One thing I've learned in my own life:
Joy doesn't disrespect grief.
They can exist at the same time and be completely separate from each other. Sane token (leaving that as a freudian typo); fear is healthy... living in fear isn't.
I found the human heart is an amazing thing. I could mourn my daughter, but still be overjoyed by my son. (Although, I too, didn't want everyone and their brother getting in the middle of what was an emotionally charged affair). I didn't relax, ever, about my son dying. I only lost my daughter between 6 & 7 months... but she could have/ would have/ what if... she died before she had a chance to live, and so far away from incubators & doctors she never had a chance. I think about her often; she'd be 13 turning 14 this year. she's one of the 2 biggest "what ifs" in my life, and I mourn her... but I take amazing joy in my son. But the thought of his death stills me. I have to work VERY hard to set it aside... and he's 8. Fortunately I think about his death less and less as he grows older... but it wipes my mind. I couldn't deal.
No matter what, it will be hard. Other people will do things that will Tick. You. Off. and be the exact worst things possible that they could do or say. So when you feel ready to deal with that... tell them.