What Causes Intense Testicular Pain With Inflammation?

I am a 25 year old male with intense testicular pain. It started 2 years ago with a gradual onset of non-specific right side testicular pain. I received a physical exam and was told nothing was wrong. The pain persisted on and off for months until finally it was so bad I went to the ER and received an ultrasound. The doctor informed me I had an epididymal cyst which becomes inflames at times and could cause pain and told me to take Motrin. Well, since then it has gotten overall better with random bouts here and there, the medication seems to make no difference at all. I've visited another doctor and a urologist who have both told me extreme pain isn't common for the diagnosis. The other day I woke up with extreme extreme pain in my right testicle. It seemed to change upon moving positions but for the most part felt like someone was squeezing my spermatic cord every 15 or so seconds, very bad pain. I managed to sleep it off and felt fine the next day. Then today out of nowhere it began again in the middle of the day and got much worse. I have noticed no swelling or change physically when looking at my testicles. I was wondering if partial torsion is a possibility. Tonight I was in such pain I was debating going to the ER but talked myself down from it. I don't believe it to be epididymal pain as the pain is much higher up in the spermatic cord near the groin and I can emulate the pain by rubbing the cord high up much further than the epididymas. The pain is very intense, but from what I read not torsion intense as I can walk and am not on the floor crying or vomiting as I have heard is usually the case. I have no pain urinating and have had no pain ejaculating. Is it possible to have partial torsion that can come and go? Would there be more symptoms like swelling or physical differences I would notice visually? Would there be any other test I could do besides an ultrasound to see what the problem is?