I'd research your diagnosis on www.emedicine.com
when you get your records or research the diagnosis now to determine if it was that and see what the treatment was that you got..ex antibiotic shot (painful anyway) I'd get your gyn note too to see if she/he try to diagnosis too. Importantly have a someone with a medical background explain it since you are not in the field yet.
As for insurance, depends on your company. Ex my husband sliced his finger and had to go to the er. Insurance paid because its an accident. my two year had a high fever and sinus drainage before we caught an airplane flight so we took him to the Er. insurance did not pay because its deemed a office visit.
Sounds you were totally covered as in..being examined, tests etc.. its better to cover it just in case. I am not a er nurse but a floor nurse that see lots of diagnosis that aren't always pure textbook. Heck, what i learned in school doesn't fan to every pt. Once you get into the field more its more and more knowledge to learn as its an art practicing medicine than true black and white science. You are getting a good start to be a cna while in school to learn these skills. Especially in the er!
Good luck to your future and keep on learning!