welcome to HCM,
as per the details u have given, u are having VARICOCELE
.. its a bunch of dilated veins sorrounding the testes.. and along with spermatic cord
known as PAMPINIFORM PLEXUS OF VEINS..SO THE ENLARGEMENT OF THESE VEINS IS KNOWN AS VARICOCELE.
the main function of these pampiniform plexus of veins is to maintain a proper temperature regulation in order to maintain the good sperm production..i.e.natural cooling mechanism
due to enlargement of these veins due to varicocele leading to pooling of blood and raise in temperature that affect the sperm production , larger veins also compresses the vascular supply throug arteries for the testicles and leading to total lose of sperm production finally leading to testicular atrophy
thats why u have low sperm count
and also the sperms are dead known as NECROAZOOSPERMIA..THIS EXACTLY INDICATED HOW FAR UR PROBLEM HAS REACHED
I SUGGEST U TO TAKE URGENT COLOR DOPPLER STUDY OF SCROTUM
AND GET THE SURGEY DONE AS SOON AS POSSIBLE TO AVOID PERMANENET DAAMAGE TO UR TESTES..
HOPE THIS WILLL HELP U