Re dreams: I really think people interpret too much into dreams. Your brain is like a computer, it needs to store stuff. it has long and short term memory areas. Dreaming is the brain reorganising the stuff in the areas of memory, its a bit like when you do 'defragment' on your computer. All the bits of info brush up against one another, which is why things in dreams seem sort of real but sort of bizarre. So even though the dreams seem horrible, it's just your brain trying to sort itself out. its a healthy sign that your brain is doing its stuff, in coming to terms with the accident, and putting it in long term memory, where it belongs.
I have dreams about neglecting children too. Especially ones that someone has asked me to look after. Sometimes they starve, or drown! And I have dreams about being chased, hunted or shot. i really dont see these as symbolic, other than in the most general way, ie that my life is a bit out of control / i am feeling fearful. Sometimes I have to congratulate myself on my vivid imagination and wonder why I cant tapp into this in waking life.
one way to avoid nasty dreams is to wake up slowly. Then you are less likely to remember the dream. There is a new kind of alarm clock where a light comes on gradually. This might be worth a try. Or get a family member to rouse you very gradually, eg by opening the curtains and turning music up slowly.
Whatever you do, dont worry about dreams being prophetic. That is just superstition.