Seen retention

@Norway1987 I will develop blue-balls after about a week of semen retention. I am currently on Day 7 and feel the need to ejaculate. If you learn your "ideal" time between ejaculations, you can minimize or eliminate the blue-balls feeling. For me, that time now is about 6 days.

Semen retention equals blue balls, which is not comfortable . What do you do about that

You may wish to consider occasional Prostate Milking as a pleasurable way of relieving your symptoms during these "blue balls" periods. You can read a pretty thorough treatise on prostate milking technique and issues from Lady Lubyanka. There is also a well written blog by Andr. titled HOW TO MILK A BULL which gives step by step descriptions of the process.
If you limit your massage activity to milking the prostate only, whilst leaving the seminal vesicles & ampula alone, and you only milk the prostate sufficiently to get a few drops of prostate fluid, you should be able to obtain the relief you are looking for without having to resort to a full masturbatory ejaculation with its attendant drawbacks.

I believe that continuing to push the time period between ejaculatory relief sessions will lessen the severity of your 'blue balls' condition. In the interim keeping your mind and body occupied with other activities will also mitigate the negative feelings. Keep regularly using your Aneros too! The reason being the prostate massage action can relax the prostate sufficiently to allow some of the fluid in the prostate to gently trickle out and down the urethra relieving the internal pressure there. It is this internal pressure which is the source of the referred pain in the testicles.
Good Vibes to You !

What is the feeling of the blue ball?
I often don't ejaculate for more than a month.
But the body is not unwell.
(English is not my native language)

@jeremyjordan It's like a dull ache in the groin, like a toothache. It will go away with an ejaculation.

I have found that after a week or so I have experienced blue balls...exercise has given me relief...I have also used prostate milking if the pain is relentless.