200 at any age is to high, way to high! Yes, you should have gone by ambulance. Was this in the US? Was your rate restored to a more normal level before driving to the other hospital? That still isn't an excuse though.
I would say so. Odd they let you go on your own but maybe they didn't want you to get charged for an ambulance ride?? Well I am glad you went to the ER. Do you know why it was so elevated? Were you in afib or some other rhythm issue? 200 at your age seems extremely high. I hope you are doing fine now.