A few days ago wife and I (51) were having sex. I came close to orgasm numerous times, held back until the urgency passed, then resumed. Due to other events we had to stop before I was able to climax. Almost right away I could feel a weight or pressure at the bottom of my ball sack. Not painful or unpleasant, just noticeable. Over the next 30-40 minutes, that sensation increased and became actual pain. The pain spread upward until it pretty much covered my entire area over my bladder. Standing upright was painful, walking or movement more so. An hour goes by with no improvement. Finally I masturbated (VERY carefully due to the pain) and had an incredibly intense orgasm. Relieved pain by about 90%. Masturbated again the next morning due to lingering discomfort and pain was completely gone.

What actually happened here? Is this what is referred to as blue balls? If so, could the pain /pressure have also been relieved doing a prostrate massage /milking?

For reference, the last orgasm prior to sex was about 4 days.