I know finished my antibiotic for over a week. And still feeling the same I’m scared.
You can have Epididymitus without having sex - i had it in my early 30s & was not involved in a sexual relationship at the time. It does take a while to heal, several weeks for me before I started feeling better. Most likely it will go away after antibiotic treatment & following Dr's instructions. If I recall, I was told to refrain from any sexual activity until things got better...