Hi there ~
I understand your concerns. I believe that you might be having varicocele
from the description of your problem. It is easily treated with surgery and I advise you to consult a surgeon for the visible lumps in the scrotum
of the testicle sack. I believe that symptomatic treatment for itching as well as pain is available over the counter and you will get relief from the same. I hope this helps.
Take care and have a lovely day!