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I don't have any good advice but my daughter just started doing the same thing as well. She didn't have a fall but accidently on vacation my mom was giving her a bath with what she thought was baby wash and it ended up being my dad's shampoo in the wrong bottle! She screamed and cried horribly and ever since has been freaking out when we go to wash her hair. Good Luck, I bet it will just be time that ultimately heals the fear.