Please explain what does a varicocele feel like?

Bag of worms: The dilated veins around the testis have a "bag of worms" feel. They rarely cause any symptoms.

Here are some ...: Varicocele occurs in 15-20% of men but in 35-40% of men evaluated for infertility. Most of them are asymptomatic, i.e., feeling nothing. If feeling something, that is some achy feeling & pressure after a long standing, but quickly relieved after lying flat for a while; so men with symptomatic varicocele feel dull ache / pain / pain in the afternoon, but feel relieved at waking up.