Not to defend the neurosis of people who don't want to call the ambulance because the neighbors will wonder what's going on, but -
Two years ago, my then 3yo son had a fever-related seizure which scared the living heck out of us. We called 911. The paramedics were prompt. He got to the ER and is fine, not lasting effects. It didn't even enter into my mind that, oh, the neighbors will wonder why there's an ambulance at my house.
Two weeks after that, my friend, Carrie, came over for dinner. She had an awful nose bleed. I'll spare you the details, but it was a complication of ENT surgery and it was very very very heavy. We called the ambulance because we were worried about the amount of blood she was losing. (She's fine now.)
Within 10 minutes of the ambulance pulling away from our house, we had neighbors coming to our door asking what was going on. We'd just had an ambulance at our house and now another one? We denied any problems, which didn't satisfy the gossips and crazy rumors circulated the neighbors about us for about a year. But since we've gone about two years without a 911 call, it has died down.