As an American citizen, the US embassy provides a list of hospitals and doctors which can help you. the list of your area is here.

The recommendation is calling the 15 from a phone line (mobile or fixed) to speak to someone who will dispatch you to the right service. They will find someone who speak English if they don't.

Finally, when you get to the hospital you can ask for the "dispositif de prise en charge des soins urgents et vitaux" which will cover the emergency expenses required to "prevent your health status to deteriorate".