I guess she is on a campaign to treat the most common STD out there which does not even cause symptoms all the time, but can cause pelvic pain. I'm sorry she made you feel that way.
Sometimes even if you are free from infection, the treatment is carried out further for few days just to ensure that you are completely free from the infection.
You should have received a call from the ER telling you your culture results; that is common practice in the US. Give them a call during off-peak hours, ask to speak to a nurse and ask what were the results of the culture (you will need the date you were seen and your medical record number). They can look this up in their computer to see the results. If they tell you that you have to complete papers to obtain medical records, then just ask them, "was I treated appropriately for the disease the doctor thought I had" and see what they say. If they still give you a hard time, then complete the paperwork for medical records and then you will know if you actually had the disease or was the doctor over-reacting, and if you had the disease were you given the correct treatment. You would know if you were given the right treatment if you symptoms are better and you should have been instructed to follow up with you doctor.
Let us know if you have any questions.