Suggest Treatment For Blood In Semen

Hi, half a year ago, I had found minor blood in my semen, followed by a few days of left testicle pain, radiating to my lower left pelvis area. I went to the doctors, did a urine test, ultrasound on my testicles and prostate. All results came out normal, so doctor concluded that I was being too rough and might popped a vessel. Then everything was normal, pain were gone. However, 3 days ago, I think I might have went too rough during masturbation, and I did a forceful ejaculation. I felt pain when I ejaculated, in my urethra, then radiated to my lower pelvis. And now, I would feel pain in my lower left pelvis area. I have no fever, urinate regularly and normally, no swelling in testicle area. So I m wondering if the pain is simply just because I masturbated and ejaculated too roughly, or there s some other problem?