My epididymis on both testicals often swell up when i'm active and goes down when resting, i hav no urine infection, is this normal?

Scrotal swelling: Scrotal swelling may be associated with fullness of the contents including testicles, veins, or fluid retention. If it is not painful, this is generally a good sign. Causes may include hydrocele (fluid collection) or varicocele (vein engorgement). These are both relatively benign and should not cause concern.

Epididymitis: Most of the time urinalysis and urine culture are negative with epididymitis and orchitis. What you describe is not really normal. I would seek out an examination/opinion by a urologist.