I think you should meet a surgeon right away as the way you describe the varicocele
is significant enough to cause infertility
The basic mechanism is it would increase the temperature around the testicles due to increased blood flow and hence lead to infertility.
Second thing is as it is a progressive disease if not taken care now it may increase further in size and may also move to next testicle in a short period of time,so better it is to show up now and take proper treatment now.
The surgeon would advice you on whether the treatment is required or not depending on the examination findings.
Don't worry, and avoid heavy weight lifting and heavy exercises for a few days until you show up a doctor.
Dr. Om lakhani.