What are the causes of reoccurring swelling of the right testicle?

Hello doctor,

I am a 16 year old, I have a reoccurring swollen right testicle since I was about 12 years old. Whenever my right testicle swells up, I feel a tension in my lower abdomen, and it becomes difficult to perform any physical activities. Whenever my testicle is not swollen, it feels as if it is being held up by an extra muscle that flows from my lower abdomen to my testicle area. My left testicle hangs freely, while my right testicle is higher up and feels like it is being held up. When I flex my abdomen, my right testicle goes up by about an inch or so. This swollen testicle occurs a couple of times a month but is completely random with no patterns that I have observed.

About a year ago my right testicle swelled up bigger than it had ever happened before, about three times the size of my left testicle. I went to the hospital that night, and the doctor performed an ultrasound on my testicle. He said that my epididymis was filled with fluid and that it was most likely a hydrocele. He put some pressure of my right testicle(which was swollen at that moment) with his hand, and I began to tear up because it was so painful. But I had no pain before or after he put the pressure. He then checked my left testicle, which was completely fine. He concluded that I had no hernia, they performed nothing on me and just put an ice pack on my testicle and slept. When I woke up my testicle was no longer swollen. About a month or so later I went to a urologist, and she told me nothing other than my issue was going to stop by only waiting. I still have the same issue as before. I have done some research and never found anything about a reoccurring hydrocele. Mostly, I just read about guys who dealt with a swollen testicle and simply got surgery for it, but their hydroceles were not reoccurring. They were permanent. Please help.