The passage of time will deal with them for you.
You have suffered a major trauma, and your sub-cncious mind is still struggling to assimilate the severe shock it has received, hence the flash-backs.
I'm sorry your doctor has been so unsympathetic, but you will find that as time passes, and your daughther's health improves, the flash-backs will diminish in frequency and intensity, and eventually disappear altogether.
This is a perfectly normal reaction to a severe shock, and nothing for you to worry about. it will not affect your health in the long term, you need to learn to relax and 'ride out' the flash backs when they occur, and try and stay as calm as you can. They will recede and stop - promise!