I appreciate you posting about this topic. I can certainly understand your concern. All of us are concerned when we have been told there is a problem with our brain. I can understand that you want to get the best specialist on your side as you seek treatment. While I'm not familiar with NPH, I did find a link to some information provided by Cleveland Clinic. https://my.clevelandclinic.org/health/diseases/15849-normal-pressure-hydrocephalus-nph
As you read this information you will see that a fall (like you described) can cause a brain bleed which can lead to NPH. I would encourage you to read this article and see how it might apply to your current situation. Do you have any other symptoms, like problems walking, balance, speech, incontinence, etc.?