Suffering From Pain Near Right Testicles, Feeling Uncomfortable. What To Do?
You could be having an inflammation of male reproductive organs called epididymo-orchitis. Ideally you should have an ultrasound examination of scrotum done where a colour doppler examination might pick up an increase in blood flow to the affected organs which would generally indicate active inflammation. The treatment consists of essentially anti-inflammatory drugs, analgesics, scrotal support as you have been advised earlier. The episode usually lasts for a few days, while there might be residual swelling, and discomfort of the affected side for a few more weeks.
There is a also a possibility it could have something to do with your vasectomy operation done 3 months ago, but what that pain is far more insidious, chronic ache due to surgical blockage of the vas which is what is done during vasectomy.