Is this possible that u have epididymitis and there is no swelling every time. My epididymis swells sometimes and it tenders when touched. What is it?

Ultrasound? There is no way of diagnosing this over the internet, sorry. You could get a recurrent epididymitis, but it would be unlikely to resolve on it's own. You may also have a varicocoele. This is a group of varicose veins in the scrotum. The only way to solve the issue would be an exam and ultrasound if needed.