Why do I keep fantasizing about my parent's death?

I picture then dying and the aftermath, then I get really upset and cry buckets. It's been happening a lot recently, the last time it happened was on the bus and people were giving me strange looks and moving away. I'm contemplating wearing sunglasses all the time just in case it happens again. It seems I can't control when I have these thoughts - they just pop into my head, then I feel really guilty and cry some more. Wth... I'm not even an emotional person. I very rarely cry in public. It feels so real (their death) and like I'm actually grieving. What's all this about?

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