Hi and thanks for posting.
Epididymitis is inflammation of a coiled tube, the epididymis, that resides in the the testicles. Most cases (but not all) stem from chlamydia infection. The incubation period is not well defined, but a span of several weeks or months after infection is often referenced in the literature.
Last question, if I have sex with a condom and I took the treatment 4 days ago. What are the chances I can give it to someone ?
Chlamydia is completely curable. It's usually recommended to wait a week or so after treatment before resuming sexual contact, but it's important for all of your recent or current partners to be treated; even if they have no symptoms they could have the infection and give it back to you.
Hope this helps. Good luck and post anytime.