Dear Dont, I hope you are getting some sleep right now. I have been thinking of you and praying for you. Your accident sounds truly horrific and I thank God that you were attended to by specialist teams and that you have on-going care. I pray that you heal and recover and that you do indeed rest as much as you can. I pray that your family continue to care for, love and value you and they offer support to the best of their abilities.
I think that trauma can cause amnesia, it is a protective measure and I pray that your memory will recover as you do and become more able to process things.
After my grandmother died, I often felt she was with me at difficult times, and my sister 'saw' both my grandparents after her DD was born sleeping. Not as clearly as you describe, but neither of us have ever had brain bleeds, or were at deaths door. I think science provides one rational explanation, but faith provides another. A brain bleed is life-threatening as were your other injuries so there is a space between life and death which provides a way for your loved ones to support you even if they have passed on. I don't think science can explain that experience as too many people report it.
You remain in my prayers, and I pray that in time you will receive psychological as well as medical support. Do rest as much as you can. I am happy to send crosswords, word searches, or a book you want if you PM me your address.