Dull Pain in left testicle and groin.

I get very dull pain in my left testicle occasionally. It stays for a second and goes. It comes randomly. I have this since 2 years. I can give 3 marks out of 10 to pain according to its severity. Once if it starts, it keep triggering randomly in 1 to 10 minutes difference. And stays for about an hour to 2 days. I can feel it if I am laying, standing, sitting sometimes it reliefs after passing gas sometines I feel during cough or heavy breath and sometimes I don't feel at coughing or breathing.. It comes and goes by itself, cant make it pain on my own. I checked my testicle size, both seems same, but left one is hanging about 2cms below right one. There was never inflammation or pain if I touch or lift both testicles with palm. I tried to feel the veins of both testicles, no lump or pain or discomfort observed after touching it. After seaeching on Internet I found a medical condition called vericocele, but I am not sure if it is same or not as I don't have exact information about it.