I don't know about the death thing, I've never heard of that. I used to have a brilliant dream book but leant it to someone and never got it back. I do believe that most symbolism in dreams is what it means to you, so if a suggested meaning makes no sense to you, then it probably wasn't what your subconscious mind was trying to convey. After all, these dreams are of your making. There are however many common symbols that are used to unravel dreams and these are usually from popular lore, mythology etc that even if you weren't consciously aware of, you will have seen and stored away at some point in your life.
The thing I remember about hair is it's a common symbol of strength (someone in mythology had their har all cut off and lost his strength - Samson, maybe, sorry I can't remember!) and the fact that you got a hairdo that you'd always wanted is probably just your mind reflecting the joy of you being pregnant and finally getting what you wanted. Ha! I just realised I said reflected - there's your mirror image unravelled, maybe? That was not a conscious choice of word either. hehe. It was maybe just showing you that you got what you want and you are strong in spirit, or body or whatever.
Congratulations on your pregnancy, I think dreams are an excellent omen in pregnancy - I had the wierdest dreams ever in my pregnancy with DD, and pretty much none with the boys, despite my hormone levels raging. It was strange to me at the time and I thought maybe it would start later. I wonder now if it was a sign that they were never going to stay. That probably sounds cracked I know but it was odd.
Anyhoo H&H 9 months to you xxx