Blue balls? need advice

Sometimes, not always, after a session i get this pain in my balls and in my groin/stomach area that feels so bad that walking is quite a discomfort. I had no name for it until someone said recently blue balls, which i think is what it is! It never lasts more than a few hours but i wonder what makes that happen?

Ive had a session now and 1 hour later i now feel it, it seems to start small and get worse. When it subsides, usually after a few hours my balls are seemingly very empty/saggy...

Whats odd is my prostate is now orgasming as well! i feel so good and its just like a long nice orgasm with no device but also this pain.

I wish i could stop the pain though without having to wait. I wonder if anyone else gets this?

These are the symptoms actaully. How do i stop this in the future?

epididymal hypertension, is a temporary, harmless condition resulting from prolonged sexual arousal without ejaculation. The symptoms typically include a dull ache, heaviness, or pressure in the testicles and surrounding groin area. 

• Aching or dull pain in one or both testicles.
• A feeling of heaviness or pressure in the scrotum and sometimes the lower abdomen.
• Discomfort or a throbbing sensation.
• Increased sensitivity in the testicles.
• Restlessness or general discomfort.