Glad everyone survived your scary situation! Snakes really scare me, but I respect them, too. They are not all harmful and many, in fact, are quite usefull eating and keeping populations of pests like RATS under control. Having said that, I live in a state that has every poisonous snake in this country.
The 911 emergency number services are for criminal and medical emergencies. They try to respond to everything they can, but some things are beyond their reach and resources. Something like this would go to animal control, which is quite understaffed. The also handle the alligators.